I don't want to see my best friend because she's depressed
Do you not want to see her because she is depressed?
Because she is making me feel so depressed I can't handle her.
I'm sorry that she's making you feel that way.  However, imagine how bad she feels?  You should be there for your friends when they're dealing with serious issues like depressiong.
It's fine. she is pushing me away on purpose. I don't care since I don't want to be sad.
Just try your best to be uplifting towards your friend. Her being in a bad mood has nothing to do with what you are doing, so don't take it personally. Just realize that she needs someone to help her feel better and not worse.