La meva amiga m'ha preguntat quin color combina millor amb el seu abric blanc.

In standard Catalan, possessives are usually used together with the definite article:

• la meva amiga = my friend
• el seu abric = his/her coat

This is different from English, where we normally say just my friend or her coat without the.

So la meva amiga is the normal Catalan pattern, not extra emphasis.

Catalan possessives agree with the noun they describe, not with the person who owns the thing.

So:

• amiga is feminine singular → meva
• abric is masculine singular → seu

The main forms are:

• meu / meva / meus / meves
• teu / teva / teus / teves
• seu / seva / seus / seves

So:

• la meva amiga
• el seu abric blanc

m'ha is a combination of two words:

• m' = em = me
• ha = has (from haver, used to form the perfect tense)

So:

• m'ha preguntat = has asked me / asked me

The apostrophe appears because em becomes m' before a vowel or silent h:

• em ha preguntat → m'ha preguntat

ha preguntat is the present perfect form:

• ha
  • preguntat
• literally: has asked

In context, it often translates naturally as asked in English.

So:

• m'ha preguntat = asked me / has asked me

If you said pregunta, that would mean asks / is asking.
If you said preguntava, that would mean was asking / used to ask.

Because quin is the word Catalan uses before a noun to mean which or what ...

• quin color = what color / which color
• quina camisa = which shirt
• quins llibres = which books

què means what, but it does not normally go directly before a noun like this.

So:

• correct: quin color
• not natural here: què color

Because this is an indirect question, and Catalan introduces it directly with the question word:

• m'ha preguntat quin color... = she asked me which color...

You do not add que before quin here.

Compare:

• M'ha dit que vindrà. = She told me that she will come.
• M'ha preguntat quin color prefereixo. = She asked me which color I prefer.

So que is used for a statement clause, but not before an indirect question introduced by quin, què, on, quan, etc.

Here combinar amb means to go with or to match.

So:

• quin color combina millor amb el seu abric blanc
  = which color goes best with her white coat

Word by word:

• combina = matches / goes with
• millor = better / best
• amb = with

A very natural English translation is goes best with.

Because millor is the correct comparative/superlative adverb here:

• combina millor = matches better / goes best

In this kind of sentence, English often says best, while Catalan still uses millor.

més bé usually means something more like rather or more accurately, so it would not fit here.

So:

• correct: combina millor
• not correct here: combina més bé

seu / seva / seus / seves can mean several things depending on context:

• his
• her
• its
• their
• your (formal)

So el seu abric literally means his/her/their coat.

We understand it as her coat because the context points back to la meva amiga. If the context were unclear, Catalan speakers might rephrase to avoid ambiguity.

In Catalan, descriptive adjectives usually come after the noun.

So:

• abric blanc = white coat
• cotxe vermell = red car
• casa gran = big house

That is the normal position for color adjectives, so abric blanc is exactly what you would expect.

Also, blanc agrees with abric, which is masculine singular:

• abric blanc
• jaqueta blanca

The subject is quin color.

So the structure is:

• quin color = which color
• combina millor amb el seu abric blanc = goes best with her white coat

In other words, the sentence is asking about the color as the thing that matches the coat:

• Which color goes best with her white coat?

So combina is singular because color is singular.

Yes. Grammatically, m'ha preguntat is a present perfect form, so it can correspond to has asked me.

But in natural translation, English may prefer:

• My friend asked me... or
• My friend has asked me...

Both can work, depending on context. If the action feels very recent or still relevant, English may prefer has asked me. If it is just a completed past action in a narrative, English often prefers asked me.