Как раз в тот момент, когда мы вышли из дома, ей стало не до шуток из-за плохой новости.

Как раз means something like just, exactly, or right at that very moment.

In this sentence, Как раз в тот момент gives the idea of:

• just at the moment when...
• right when...
• exactly at the time when...

It adds a sense of timing coincidence.

For example:

• Как раз тогда я позвонил. = That’s exactly when I called.
• Он пришёл как раз вовремя. = He arrived just in time.

It is a very common Russian structure and does not sound unnatural. Literally, it is:

• в тот момент = at that moment
• когда = when

So together:

• в тот момент, когда мы вышли из дома = at the moment when we left the house

English also sometimes does this: at the moment when...

Russian often likes this fuller structure because it clearly introduces a time clause. You could make it shorter in some contexts, but here it sounds natural and idiomatic.

Вышли is the past plural of the perfective verb выйти. It shows a completed action:

• выйти = to go out / to leave as a completed event
• выходить = imperfective, focusing on process, repetition, or background action

Here the meaning is that we left the house at a specific moment, so the completed action is needed.

Compare:

• Когда мы вышли из дома... = When we left the house...
  One completed event.

• Когда мы выходили из дома... = When we were leaving the house...
  The action is in progress or viewed as a process.

Both are possible in some situations, but they create different nuances.

Из дома means out of the house / from the house.

Here:

• из requires the genitive case
• дом becomes дома in the genitive singular

So:

• дом = house
• из дома = out of the house

Russian uses из when talking about movement out of an enclosed space.

Compare:

• из дома = out of the house
• из школы = out of school
• из комнаты = out of the room

This is a very important Russian pattern.

Ей стало не до шуток is an impersonal-style construction. Literally, it is something like:

• To her, it became not for jokes

Natural English:

• She was no longer in the mood for jokes
• It became serious for her
• She stopped feeling like joking

Why ей?

Because Russian often uses the dative case to show the person experiencing a state:

• мне холодно = I’m cold
• ему стало плохо = He started feeling bad
• ей стало грустно = She became sad

So ей стало means she came to feel... / it became ... for her.

If you said она стала, that would usually need a complement like:

• она стала серьёзной = she became serious
• она стала врачом = she became a doctor

But не до шуток does not work that way.

It is an idiomatic expression.

Не до + genitive means:

• not in the mood for
• not in a position for
• not the time for
• not up to

So:

• не до шуток literally = not for jokes
• natural meaning = this was no time for jokes or she was not in the mood for joking

Other examples:

• Мне сейчас не до сна. = I’m in no mood for sleep right now / Now is not the time for sleep.
• Ему было не до разговоров. = He wasn’t up for talking.

This is a very common Russian construction.

Шуток is the genitive plural of шутка.

That is because the expression не до requires the genitive:

• не до шуток
• не до сна
• не до разговоров

Why plural here? Because Russian commonly uses the plural in this expression when talking about joking in general:

• не до шуток = not the time for jokes / not in the mood for joking

It does not mean a specific number of jokes. It is a general idea.

Good question. Both are possible, but they mean slightly different things.

• Ей не до шуток = She is not in the mood for jokes
• Ей стало не до шуток = She came to be not in the mood for jokes / It suddenly became no time for jokes for her

So стало adds a sense of change of state.

It shows that something happened, and as a result her attitude changed. In this sentence, that change happened because of the bad news.

Из-за means because of.

It takes the genitive case, so:

• плохая новость = nominative
• плохой новости = genitive

So:

• из-за плохой новости = because of the bad news

Be careful: из-за can also literally mean from behind in other contexts:

• из-за угла = from around the corner / from behind the corner

But here it clearly means because of.

Sometimes, yes, but the nuance may change.

Common options include:

• из-за = because of, often neutral or slightly implying an unfortunate cause
• от = from, due to, often used with feelings or physical reactions
• из = out of, from, because of in some fixed expressions
• по причине = because of, more formal

In this sentence, из-за плохой новости is the most natural choice because the bad news is the cause of her serious mood.

For example:

• Она плакала из-за новости. = She cried because of the news.
• Она дрожала от страха. = She was trembling from fear.

So из-за fits well here.

Yes, Russian word order is flexible, but the current order sounds natural and clear.

The sentence starts with the time frame:

• Как раз в тот момент, когда мы вышли из дома, ...

Then it gives the main event:

• ей стало не до шуток...

Then the cause:

• из-за плохой новости

This order is logical:

1. when it happened
2. what happened
3. why it happened

You could rearrange parts for emphasis, for example:

• Из-за плохой новости ей стало не до шуток как раз в тот момент, когда мы вышли из дома.

This is grammatical, but it sounds less neutral and puts more emphasis on the cause.

Because когда мы вышли из дома is a subordinate clause introduced by когда.

The structure is:

• Как раз в тот момент, когда мы вышли из дома, ей стало не до шуток...

The clause когда мы вышли из дома is inserted inside the larger phrase, so it is set off by commas.

This is similar to English:

• At the very moment when we left the house, she stopped feeling like joking.

Russian punctuation regularly separates subordinate clauses like this.

It is singular genitive.

The base form is:

• плохая новость = bad news / a bad piece of news

After из-за, it becomes:

• из-за плохой новости

Even though English news is grammatically singular but refers to information in general, Russian новость is a normal countable noun:

• новость = one piece of news
• новости = news items / pieces of news

So here it means because of a bad piece of news or simply because of the bad news.

It is natural and correct. It sounds like standard written or spoken Russian.

A native speaker would understand it as:

• Right at the moment when we left the house, she stopped feeling like joking because of some bad news.

The most useful things to learn from it are:

• как раз for precise timing
• в тот момент, когда... for at the moment when...
• perfective вышли for a completed event
• ей стало for a change of state
• не до + genitive for not in the mood for / no time for
• из-за + genitive for because of