People get frustrated if they feel they are giving and giving and they are not receiving anything in return. Depression is tough because we just don't feel like giving back, I know I don't like giving back when I am in a very low mood. She probably got tired of trying to get you out of your funk. I know you feel abandoned, but maybe its time you get out and do stuff out on your own and become more independent (I know its hard) and not worry about her too much because she is out enjoying her life.

Once she sees you out of your shell, she might be more open to doing stuff with you again. I know its hard to swallow, but she is probably just tired of giving so much and she just doesn't understand your depression. That is that just my opinion.