The backing up is likely the itchies. Rub petroleum jelly up high under her belly, covering her nipples, the underside of the tail and her "privates". Use lots as the bugs don't like it. It usually lasts about 3 days.
Yes I do rotate through different wormers. When I first got her I cleaned her udders the first time without a problem and have never been able to do it since. I actually never thought about the fact there could be some thing wrong. I have the vet coming out to check the tooth I will have them check her udders as well thanks
I don't mind curiosity, but there is one area you mentioned that it could get dangerous, especially if she winds up losing her balance; when you are handling her feet...don't let her twist herself up in crazy shapes, just to see what you are doing. Teach her to keep her nose out of your business when you are messing with her feet...all it would take is one time of her losing her balance, and you could both be hurt. Just a guess, but I'm sure your farrier probably is not too keen on that behavior either...
Other than that, let her be curious...as has been mentioned, it is a good thing, in most instances, since she definitely "thinks" rather than "reacts" in most circumstances.