Chomp, Chomp!

Beneath this adorable, innocent little face is a problem that I haven't quite figured out how to correct. Bianca loves to bite. In particular, she enjoys chomping down on her Mommy. I've read that this nasty behavior could stem from the child's frustration, but her biting antics seem to come out of nowhere. One minute we are cuddled up, reading a story; the next minute, she is chewing on my flesh. She does it in the middle of play. She also does it when she is tired and doesn't like my requests. She does it whenever the mood hits her - which has been quite a lot lately.

I've taken the advice I've found online. Stated, "This is biting. We do not bite people." I've tried simply talking to her. For instance, "If you want Mommy to put away my book, please ask me. There is no need to bite." I've given her time-outs. I've smacked her hand. I've even given her a small bite back - all to no evail. I really don't know what else I can try.

Is anyone else dealing with or have dealt with a biter? Is there any corrective action you can suggest? As far as I know, she isn't biting anyone else. She doesn't bite her dad, and she doesn't seem to bite any other children when she is around them. I seem to be the main target.