It may not be her business, but she is concerned..maybe even worried. You think you could just ask her, "would you leave me alone with this depression shit", of course don't say that, but maybe something?
I can relate with the teacher thing, mine also used to ask alot of personal things that I didn't want to share.
Who's ignoring you? It seems like this teacher is trying to help, trying to reach out..but it's obviously not working.
Is there a reason why you can't?