На ужин к нам пришла соседка, и мама сразу заметила её новые серёжки и браслет.

Russian word order is much freer than English word order. Both versions are possible, but they put the focus in different places.

• На ужин к нам пришла соседка starts with the setting: for dinner / to our place, and then introduces the person who came: the neighbor.
• Соседка пришла к нам на ужин is more neutral if you simply want to say The neighbor came to our place for dinner.

In the original sentence, the speaker is likely setting the scene first and leaving соседка as the new or important information at the end of that clause.

На ужин means for dinner or to dinner.

Russian often uses на + accusative with events, meals, and activities to mean to/for that event:

• на ужин — for dinner / to dinner
• на завтрак — for breakfast
• на обед — for lunch
• на концерт — to a concert

So На ужин к нам пришла соседка is literally something like For dinner, the neighbor came to our place.

К means to, toward and requires the dative case.

So:

• мы — we
• нам — to us
• к нам — to us / to our place

With verbs of coming and going, к + dative often means to someone’s place:

• прийти к нам — to come to our place
• зайти к другу — to stop by a friend’s place
• поехать к бабушке — to go to grandma’s place

So к нам пришла соседка means not just came to us in an abstract sense, but more naturally came over to our place.

There are two things going on here:

1. Gender
   The subject is соседка (female neighbor), so the past tense verb must be feminine:

   • пришёл — masculine
   • пришла — feminine
   • пришло — neuter
   • пришли — plural

2. Aspect
   Прийти / пришла is perfective, which fits a completed event: she arrived / came.

If you used приходила instead, that would be imperfective and would suggest a different viewpoint, such as repeated action, background description, or emphasis on the process rather than the completed arrival.

Here, the sentence tells a simple completed event, so пришла is the natural choice.

Because и is joining two full clauses, each with its own subject and verb:

1. На ужин к нам пришла соседка
2. мама сразу заметила её новые серёжки и браслет

In Russian, when и connects two independent clauses, a comma is normally used.

Compare:

• Мама заметила серёжки и браслет.
  No comma: one clause, two objects.

• Соседка пришла, и мама заметила серёжки.
  Comma: two clauses.

Сразу means immediately, right away, or at once.

So:

• мама сразу заметила = Mom immediately noticed

It tells you that the mother noticed the jewelry as soon as she saw the neighbor, not later.

Yes. Заметила is the past feminine form of заметить, which is a perfective verb.

Perfective is used here because the sentence presents one completed act of noticing:

• the neighbor arrived
• Mom noticed the jewelry

This is a typical sequence of completed events in narration.

If you used the imperfective замечала, it would sound wrong here unless you meant something like repeated noticing or a more descriptive background sense.

Here её is a possessive pronoun meaning her:

• её новые серёжки — her new earrings

Russian её can also be the object form her, depending on context, but here it is clearly possessive because it comes before a noun and shows ownership.

Compare:

• Мама заметила её. — Mom noticed her.
• Мама заметила её серёжки. — Mom noticed her earrings.

Same form, different function.

They are direct objects, so they are in the accusative case. But with inanimate nouns, the accusative often looks exactly like the nominative.

Here is what happens:

• серёжки is plural, inanimate
  Nominative plural: серёжки
  Accusative plural: серёжки

• браслет is masculine singular, inanimate
  Nominative singular: браслет
  Accusative singular: браслет

So the form does not change, even though the case is accusative.

The adjective works the same way:

• новые серёжки — accusative plural inanimate, same form as nominative plural

Grammatically, новые agrees only with серёжки, because:

• новые = plural
• серёжки = plural
• браслет = singular masculine

So as written, the sentence most directly means:

• her new earrings and bracelet

If you want to make it clear that both were new, Russian normally repeats the adjective:

• её новые серёжки и новый браслет

That is an important detail, because unlike English, one adjective form here cannot neatly agree with both nouns when their number/gender differ.

Ё is pronounced like yo and is always stressed.

So:

• её is pronounced roughly yi-YO
• серёжки is pronounced roughly si-RYOZH-ki

This matters because ё is a different letter from е, even though many printed texts replace ё with е. Learners should know the real pronunciation:

• ее in normal writing may actually stand for её
• сережки in normal writing may actually mean серёжки

So when learning vocabulary, it is very useful to know where ё belongs.

Russian has no articles like a or the.

Whether something is a neighbor, the neighbor, mom, or the mom is understood from context, word order, and the situation.

So:

• пришла соседка can mean a neighbor came or the neighbor came
• мама means mom / my mom / the mother, depending on context

In this sentence, English would naturally say the neighbor and Mom, but Russian does not need separate article words for that.