My mom's Panterusha got rid of her biting habit just a year or so ago (she's 10). She liked to bite when we were petting her. I learnt (in time) how to avoid it. I knew exactly after how many pets she was supposed to turn her head and mmmmiam take a good bite. It was not painful, but this feeling of "in some seconds I'll have her teeth on my hand" was not helping Yes, we kept telling her "No", or using the "high pitched yelp" (rosethecopycat's term )

Good luck with Bonnie. Let's hope, she's just a kitten yet and she'll grow over it soon.