That would certainly explain the nippiness. Experiment with different sounds, both hi & low tones. Sometimes ferrets will hear one end of the sound spectrum but not the other. If your ferret is hearing impaired you need to train her to hand signals. Pick a couple and use them consistently when interacting with her. She'll soon learn what you want. You also need to devise a way of calling her, like flipping a light switch or beating on the floor.
If she's a Marshall's ferret and you still have her paperwork you can probably get the purchase price back by having your vet put something on letterhead attesting to that she is deaf. I know that's probably not important but it should cover her vax for the first 2 yrs.
I've had several deaf babies over the years. I've found that they're usually quite bright and easier to train than hearing ferrets. I guess it's because they have fewer distractions. They also tend to be more vocal than hearing ferrets.
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