If she is going to be like that, tell her she is uninvited and don't even think about showing up or you'll have her thrown out.

"Mom,... kiss my grits. My wedding, my dress. You might have some input IF you helped."

People can't demand to pick out things they're not paying for. If you let her, you're giving her freedom/opportunity to make more demands about your wedding and your marriage.

be sure to tell her no. she can come as a guest. that's it. you have everything else under control.

No since she doesn't want to do anything else I wouldn't let her near my dress ain't no telling WHAT she would do OP

Boundaries... Find them and keep them.

I know the feeling. My mother is trying to tell me who I can and who I can't invite to my wedding. If so and so comes or doesn't get invited I am not going. Tried on a dress that I fell in love with and all I heard was "you need to keep looking, "somethings look better on the rack then they do you", and "not my decision, but you shouldn't get that dress." She keeps telling people we still have lots of time to plan. My question to her is who is this we? Last I knew this was mine and my fiance's wedding not yours. Whom doesn't like her and she has no idea why. Hmm...

Sounds like she shouldn't even be invited.

It doesn't. matter what she thinks, OP. If you like then just put a ring on it.

I'm guessing her written invitation will have a change of venue in a different town and the fix up one you sent out got lost in the mail?