How to get a chihuahua to not bite me?

She certainly has reinforced his behaviour. The best thing to do is to tell her to ignore the dog when he does this as long as he doesnt attack you. Sit down near him and just stay there, and let him do what he wants. He will probably get used to you. After awhile, maybe a week of doing this daily, try getting close to him. Take it in gradual steps and he may just tolerate you!