should have been taught that placing her teeth on human flesh was off limits. you needed to do what another dog – starting with her mother and litter mates – would have done: squealed or yelped when they were bitten and then stopped playing immediately. this is exactly what you need to do now: make a loud startled noise when she puts her teeth on you and stand up and walk away. ignore her completely.
the message is that when her mouth touches your skin, all fun stops immediately. at this point when you have let this go on for so long, you need to be 100% consistent in never accepting 