Have you gotten treatment for your depression? I'd say that's the first thing you should do. Either get into therapy, or see your doctor and get on an antidepressant. But you need to do SOMETHING to get this depression under control. And let your mother KNOW that you're doing this! Tell her that your depression is what has caused all this terrible behavior, and that you're definitely making changes so that you two can get back to normal! I'm sure you've already told her that you want things the way they used to be.

But if she sees you taking STEPS to change things, perhaps she will come around and begin to talk and react more to you.
I'm sorry this happened, but I totally understand. Depression is awful, and I would have hoped that she would understand, but perhaps she just didn't recognize that it WAS depression. And perhaps she doesn't realize that depression CAN be very serious -- and that it is a disease! It is recognized by the American Medical Society as an Illness! Perhaps if she knew that, she would be more understanding. Other Societies recognize it too.
So either see a therapist or your doctor. But do it soon so you can get a hold on this depression. I wish you the very best! Please let us know how things go, will you? I'd personally REALLY like to know! God bless and please take care. Hugs, Lee