XPost from 09, BM Help!

I need you advice ladies. I have a BM, who I was really close with, and I was in her wedding a little over a year ago. When I got enaged in March I asked her to be a BM and she was so excited and said that she was so glad I asked. More recently I said that I knew that she was busy being married now and working so if she didn't want to do it, I would be ok, and she said that she wanted to do it. But I never hear from her, and I've only seen her once since I've gotten enaged. She also has not returned my phone calls. I am really just unsure of what to do. I want my BM's to be girls that I'm close with and people that will be in my life forever, and we seem to be drifting apart. Like I said the times that I do talk to her she says she wants to be a BM but I'm just unsure now. Sorry so long, but I need some advice, also we are supposed toget the BM dresses next weekend, and I haven't heard back from her for that either. I don't expect my wedding tobe everyone else priority, but I do want my friends to have some interest. TIA Ladies and any advice would be appreciated!