Meine Kollegin antwortet im Chat sofort, obwohl sie heute frei hat.

Because Kollegin is a feminine noun, so it takes meine in the nominative singular.

• der Kollege = male colleague
• die Kollegin = female colleague

Since Kollegin is the subject here, it is in the nominative case:

• Meine Kollegin antwortet ...

If it were masculine, you would say:

• Mein Kollege antwortet ...

antwortet is the present tense of antworten.

• ich antworte
• du antwortest
• er/sie/es antwortet

German often uses the present tense for things happening right now or for general present situations, just like English:

• Meine Kollegin antwortet im Chat sofort. = My colleague replies / is replying in the chat immediately.

In a normal German main clause, the finite verb usually comes in position 2.

Here the sentence begins with the subject:

• Meine Kollegin = position 1
• antwortet = position 2

Then the other information follows:

• im Chat
• sofort

So the structure is:

• Meine Kollegin | antwortet | im Chat | sofort

This is one of the most important word-order rules in German: main clause = verb second.

im is a contraction of in dem.

• in dem Chat → im Chat

Here it means in the chat.

German often contracts:

• in dem → im
• an dem → am
• zu dem → zum
• zu der → zur

So:

• im Chat = in the chat

Because this sentence describes a location, not movement.

German uses:

• dative after in for location
• accusative after in for direction/movement into something

Here, your colleague is replying within the chat as a place or medium:

• im Chat = location/setting → dative

Compare:

• Sie schreibt im Chat. = She writes in the chat.
• Sie geht in den Chat. = She goes into the chat.

sofort is an adverb meaning immediately / right away. In German, adverbs often appear after the verb and after some other sentence elements, depending on emphasis.

Here:

• Meine Kollegin antwortet im Chat sofort

This sounds natural and means she replies immediately.

You may also hear:

• Meine Kollegin antwortet sofort im Chat

Both are possible, but the emphasis can shift slightly. In your sentence, im Chat is presented first, then sofort adds the idea of quickness.

obwohl means although / even though and introduces a subordinate clause.

In a subordinate clause, the finite verb goes to the end.

So:

• obwohl sie heute frei hat

Compare with a main clause:

• Sie hat heute frei.

After obwohl, the verb hat moves to the end:

• obwohl sie heute frei hat

This is a very common pattern in German with words like:

• weil
• dass
• wenn
• obwohl

Because obwohl creates a subordinate clause, and in subordinate clauses the conjugated verb usually goes to the end.

Main clause:

• Sie hat heute frei.

Subordinate clause:

• obwohl sie heute frei hat

So the final hat is not random—it follows a standard German word-order rule.

frei haben is a common expression meaning to have time off, to be off, or to have the day off.

So:

• sie hat heute frei = she is off today / she has today off

This is an idiomatic expression. It does not literally mean she has free in English, even though that is what the words look like individually.

You will often hear:

• Ich habe morgen frei. = I’m off tomorrow.
• Hast du am Freitag frei? = Are you off on Friday?

German word order inside the middle part of the clause is flexible, but some orders sound more natural than others.

In:

• obwohl sie heute frei hat

heute gives the time, and frei belongs closely to hat frei as part of the expression frei haben. Putting heute before frei sounds natural and neutral.

So:

• sie heute frei hat = normal, natural order

You might technically rearrange parts for emphasis in some contexts, but heute frei hat is the usual choice here.

Yes. antworten often takes a dative object when you say who someone is replying to.

For example:

• Ich antworte meiner Kollegin. = I reply to my colleague.
• Sie antwortet ihm sofort. = She replies to him immediately.

You can also reply to something with:

• auf + accusative
  • Sie antwortet auf die Nachricht. = She replies to the message.

In your sentence, no object is stated, so antwortet stands on its own:

• Meine Kollegin antwortet im Chat sofort.

Because the second clause refers back to meine Kollegin, and German normally uses a pronoun there instead of repeating the noun.

So:

• Meine Kollegin antwortet ..., obwohl sie heute frei hat.

Here sie = my colleague

This works just like English:

• My colleague replies immediately, although she is off today.

Repeating meine Kollegin would sound less natural:

• ..., obwohl meine Kollegin heute frei hat.

That is still grammatically correct, but using sie is smoother.

Yes. You can also say:

• Obwohl sie heute frei hat, antwortet meine Kollegin im Chat sofort.

That is perfectly correct. When the subordinate clause comes first, the main clause still follows the verb-second rule, so:

• ..., antwortet meine Kollegin ...

Notice that German does not put the subject first there:

• not ..., meine Kollegin antwortet ...
• but ..., antwortet meine Kollegin ...

This is because the whole first clause takes up position 1, so the verb must come next.