My New Weight Loss Causing Some Issues For Others?

You never know what a person might be going through. I know you say you have done a lot of kind things for her which im sure she appreciates and that the 2 of you were close. You're probably thinking that even if she was going through something that as close as you all were she could still reach out to you or at the least answer your calls etc. Sometimes when a person is dealing with something heavy they just need some alone time to get themselves together. I would hope that she would be happy for you and not jealous. You seem like a great friend to her and good friends are hard to come by. I'd doubt she'd just throw that away. Give it sometime.
I'm a spiritual person so my advice is to keep her in prayer for whatever her reasons my be for avoiding you and at the same time you keep doing what you've been doing. I wouldn't take it personally. I've always believed that some folks are only in our lives for a season. Maybe her season is up or vice versa. If not then eventually she'll come around.