Thank goodness you have rescued Lexi! Sounds like she is going to be in heaven in her new home with good food, medical care, and plenty of loving. I can imagine how you felt when the lady reached in and smacked her like that -- couldn't get out of there fast enough I bet!
I too would let her keep her tail since it was not docked in her first few days. Now there are all sorts of nerve endings, cartilage and such. Let her be unique.
Congrats on your new girl and I am sure those worms will be taken care of in no time and then you all can fully enjoy your new family member!