Some masturbation does no harm. It is normal and it is best to ignore it. If you try to stop it and tell your children that it is bad, they may feel that they are naughty, or that sex or sexual feelings are bad. Sometimes, when young children play together, they push, hit, slap, or bite. Biting and forceful hitting must be stopped right away.
Most children bite and hit when they are feeling angry.
I cannot let you bite. After a minute or two, ask her if she is ready to play again without biting or hitting. If she says yes, let her return to her play. Model good behavior. Never bite or hit your daughter back.