Hi there. My Dad has been depressed as long as I can remember. Its very difficult trying to deal with moodswings when your going through puberty and exams!
As a result we never had a very good relationship, but I do regret that I didn't give him enough support when I lived at home.
We get on better now and sometimes its good having a Dad whos been through a similar situation to me!

Hang in there. Just remember that she does still love you despite being unable to communicate it well.