interactions with 14 year old daughter

I have one daughter (age 14) and four sons. My daughter has become somewhat withdrawn over the past year and likes to spend time away from the rest of us. She’s super talented musically but she seems to thrive on having different interests than the rest of us. She seems to fluctuate between being over-the-top crazy (acting super dramatic and buggy) or withdrawing, not talking, and when she does talk, saying “Sorry” after anything she says. I guess today my question would be this: what do I do when she says Sorry. I have so many other questions, but I’ll start there.