How can I help my depressed friend who is struggling with obesity?

Willow4
I've had this friend from way back in high school who has always been very large but is a lovely funny kind girl and has always been here for me.

She has always been big but has been gaining at a rate of knots lately to the point where she is very depressed. I try to take her out and cheer her up, I try to take her places where we don't have to sit and eat, the movies because it's dark and she feels more comfortable. I never suggest clothes shopping because I know it can make her down, but lately she doesn't return my texts or calls. I paid for both of us to get gym memberships and I went round and helped her buy something to wear there that was comfy fitting and said I'd work with her and go for walks, even do some crazy stupid dance dvd at home that we can both be crap at lol.

Lately she says she hates me and why do I bother with her and that I wouldn't understand because I look normal, even though I've tried explaining that I find it hard sometimes. She can be harsh sometimes but I try not to take it to heart because I know it's the pain talking.

I want to help but I'm getting to the point where it's beginning to make me unhappy too, I really don't know how to be a good friend to her. Any indeas?
How can I help my depressed friend who is struggling with obesity?
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