Need Help with MOH issue

Im Having trouble with my MOH. We went to look at dresses a month ago. She said that she would buy the dress by where she lives. I understood that. I had a few girls that backed out on me because they cant afford it. I emailed her making sure that she was still going to be able to be part of the bridal party and she gives me a big attitude. That she didnt go look at dresses with me for nothing. I understand her point, but so did the other girls. And she says she thinks its weird that Im asking her now after looking at dresses. Am I wrong for asking her? I want to make sure. She never answered my question, just gave me attitude. I emailed yesterday to see if she went to see if she looked at the dress again and she didnt respond. I know that she read the email.

I have also heard through my mom that what ever my other girls are planning as for showers and what not, she has nothing to do with and is not going to be showing. And I am bit nervous that she wont be there for the wedding either.

I dont know what to do. Should I talk to her, Let her know how I feel, or tell her forget it?