
I'd definitely recommend you find a ring craft you like - without expert help here you're in danger of escalating this issue and at shows themselves it is not possible or, IMO, ethical to try to train your dog out of this behaviour. Dogs attempting to bite, regardless of breed, size, hormones, are an absolute no-go for judges and this is made clear under KC rules. This time you were incredibly lucky that the judge did not report the incident - your dog could be banned from showing entirely.
It doesn't sound so far as though she actually can't be won around - it's just that she formed a habit (the growl) which is effective, however at LKA the habit she enjoys success with thus far failed her so she tried her next bet - snapping. That for sure is one that you cannot allow to become an acquired habit.
At ring training start slowly, getting her gone over only by experienced folks - not learners dabbling in how to go over a dog! Explain *beforehand* that she has this problem, trainers are not target practice after all! When you have her comfortable to be gone over with her head minimally examined and she is well behaved reward her lavishly. I'd introduce a word with the reward such as 'watch' or 'show' so that when you use this word in future she knows exactly what's about to happen (her being manhandled) and that it means she gets an extra special treat immediately follwing. Gradually build up the handling of her with the trainer(s) so that the length of time spent on examining her head in particular is gradually built up, to a point where it is unlikely any judge would take that same time frame :)
Without seeing her it's hard to establish if her behaviour is a lack of confidence in some situations or completely the reverse. Someone at training class may well be better able to guide you towards what her motivation is - is it 'go away, I'm scared' or 'just try it mate, bog off!'
Just going out now but hope this helps a bit :)
regards, Teri