I have to agree with Ditchie ,soon you are going to have to stick your hand down a hole when your hand is covered with blood to pull a rabbit out, ask yourself the question will you have 100% confiedence in her not to bite you ??? .If the answer is no then I would start looking looking for another pair of ferrets . 2 youngsters that you can put the time into them and know that they shouldn't be biters.
Is it fair to pass this jill on to another person who might be less experienced ?