Stoop down to her level when she bites and firmly say "NO! No biting! That hurts! Look, you hurt Mommy!" Make sure you make eye contact. Tell her to give you a hug for hurting you. If that doesn't stop it, do the same thing, but also swat her on the bumper 1 time for each year she is old. Even if she one year old - she is NOT too young to discipline!