Well .... it IS a public place. She has every right to be there, but it's what she does when she's there that bugs me.
Don't worry, or feel sorry for me - I brought this on myself, and I'm sure it'll fade with time. My lights will get to her eventually, or I just switch things up and work somewhere else. This restaurant is not thriving, and it actually might be a good time to start making other plans. This all might be a good thing.