Når min datter scorer, kommer hendes hold foran i kampen.

Når means when here, and it is used for something that happens generally, repeatedly, or is expected.

In this sentence, the idea is:

• every time my daughter scores
• or whenever my daughter scores

Compare:

• Når min datter scorer ... = When my daughter scores ...
• Hvis min datter scorer ... = If my daughter scores ...
  This sounds more uncertain or conditional.
• Da min datter scorede ... = When my daughter scored ...
  This is normally for a specific event in the past.

So når is the natural choice here.

Because Når min datter scorer is a subordinate clause, and it is followed by the main clause:

• subordinate clause: Når min datter scorer
• main clause: kommer hendes hold foran i kampen

In Danish, when a subordinate clause comes first, it is separated from the main clause with a comma.

This is because of the Danish V2 rule in main clauses.

In a Danish main clause, the finite verb usually comes in the second position. When a subordinate clause is placed first, it counts as the first element, so the verb comes next:

• Når min datter scorer, kommer hendes hold foran i kampen.

Structure:

1. Når min datter scorer = first element
2. kommer = finite verb in second position
3. hendes hold = subject

This kind of word order is very common in Danish.

Danish often uses the present tense for:

• general truths
• repeated actions
• situations that happen whenever something else happens

So Når min datter scorer, kommer hendes hold foran i kampen means something like:

• whenever she scores, her team takes the lead

It does not have to mean only right now. It can describe a general pattern.

The infinitive is at score.

So:

• infinitive: at score
• present tense: scorer

This is a very common pattern in Danish:

• at spille → spiller
• at købe → køber
• at score → scorer

In sports, score means to score a goal / a point.

Because sin/sit/sine can only refer back to the subject of the same clause.

Here, the main clause is:

• kommer hendes hold foran i kampen

In that clause, the grammatical subject is hendes hold, not min datter.

So you cannot use sit here to refer back to min datter across the clause boundary.

Compare:

• Min datter elsker sit hold. = My daughter loves her own team.
  Here sit refers back to min datter in the same clause.

But in your sentence, the reference is outside the clause, so Danish uses hendes.

There is a difference in meaning:

• kommer foran = comes into the lead / gets ahead
• er foran = is ahead / is in the lead

So kommer foran emphasizes a change:

• before the goal, the team was not in front
• after the goal, the team moves into the lead

That makes it a very natural choice in a sports sentence.

Foran literally means in front or ahead.

In a sports context, komme foran means:

• to go ahead
• to take the lead

So it is not about physical position on the field. It is about the score.

I kampen means in the match / in the game.

It tells you the context in which the team takes the lead: during that game.

Useful comparisons:

• i kampen = in the match
• til kampen = at/to the match
• under kampen = during the match

So here i kampen is the natural way to say that the lead happens within the game itself.

Because Danish possessives such as min, din, hendes, vores already act as determiners.

So Danish says:

• min datter = my daughter
• hendes hold = her team

You do not add another article in front.

Yes. Hold is the normal Danish word for team in this sentence.

So:

• hendes hold = her team

It is a very common word in sports and other group activities.