My sister is pregnant...I think only a few months along. She is married and has 2 kids. She was acting normal (for her) until the last few weeks. She suddenly decided that she doesn't want to be married anymore, told her husband that he can keep their kids, and she won't make an appointment to see a ob-gyn. She hasn't been to the doctor yet, and she won't even talk about it. She won't talk to our family, refuses marriage therapy, and she just wants to be free to do whatever she wants. Could this be depression?