Re: How do you deal with.....
You said the senseis are offering take care of it so let them do that. I don't know what their plan is but if they take care of it and nothing changes then in my honest opinion you need to find a different place to train.
Refusing to work with her is something you also need to discuss with your sensei. I can't imagine many senseis who will allow a student to refuse training with someone without getting the sensei's approval to do so.
I've been following this post. People have been giving good advice. You may not be happy with the outcome but without us being in your dojo I don't think there is much more advice you can be given.