To be blunt, she sounds like an asshole, not a friend. I'm not really sure how long you two have been friends, and if this new persona she's taken on is new, or just something that's manifested from an already obnoxious way of acting, but listen to what Steffi said.
Just keep doing what you like to do. If lolita is your thing, then keep on rocking it. However, you'll need to make your stance clear and tell her what she is doing is not okay and you're not going to tolerate it. If she can calm the hell down, great. If she's going to continue berating you for it and putting you down, kick her to the curb and keep doing what you enjoy.
Friends don't act this way.