Stop in for a cup of coffee

ScampMike said
let her hear you telling the "victim" that you want to be notified when these incidents occur so you can punish her for it - and then actually punish her when it happens

straightlinespeed said
That is a tough one, but only way I know that works is to bite her back... Of course, you would have to sit her down and have a talk about biting. You may not agree, but it worked with my daughter, and it has worked with every other parent I know that had a similar problem. Curious though, does she do it to everyone and anyone or just certain people?

Tried both of those. Even tried putting soap, vinegar etc in her mouth when she does it, its normally to kids her age or younger. She won't do it if there's older kids around