Biting Fuzzy!!

We aquired our first ferret in March. She was purchased at a pet store. About a month later we heard about the AFS and got a playmate for our first baby. Then we inheireted another fuzzy about a month ago. The problem we have is that our initial ferret, Sally is a biter!! We have tried placing her in a small kennel for about 45 seconds to a minute. At first, this worked really well, but now it seems to make her more aggresive. As we are relatively new to the world of ferrets, we would appreciate any and all suggestions!! We love all of our fuzzbutts, but Sally's biting has to stop!! She draws blood quite often, but can be great somedays. She does not like change at all!! Any hints would be great!!