I know he's not a ferret, but a guinea pig, and no, he's not deaf, but we had an extreme problem with Jack an his biting, too. I knew the conditions where he came, and new if I worked with him, things would calm down, and you know, he is the most loving guinea pig. He will actually cry to be picked up.
Once you conquer all Winnie's boundaries that she has with being deaf, she will learn to trust you fully, and then bond between you and her will be forever strong! Remember, hard work all ways pays well in the end!