I'm with the people who said put a sign up. I'd put it right on the fence by her house.
Also, try having a really really nice conversation with her. She probably won't listen, but it can't hurt.
Last of all, teach Dozer that biting you is NOT ok. I hand feed my horses all the time and have never been bitten or had one of them attempt to bite me. I also play with Soda's lips because he loves it. He's a nibbly horse (ropes, gates, reins, etc) that will lick my hands like crazy and groom my back, leg, and hair but he has NEVER tried to bite or nibble on me.