One thing good to do is socialize her with other dogs and puppies. They tend to be the best at letting one another know just how hard of a bite is acceptable. Also you should say "Ouch!" Everytime she does it and also put her down so she knows that biting leads to no affection from you. I had the same problem with my Black Lab and this worked well for her. I also bought many many different chew toys of different textures etc. Some stuffed toys, squeakers, nylon bones etc. They use their mouths the way we use our hands. Hope this helps!