If you and yours are regulars at the pub, and it sounds like you are, have the manager deal with her. You're good, steady customers, and it's bad business to let some jerk drive them (you) off. I was at a workshop last summer that touched on this topic. The teacher said not to give them the attention they wanted, because they'll only demand more. (Actually, he said, "Squash 'em like a bug." but he was talking about street theatre/clowning and related suchlike.) I don't know a diplomatic way to deal with this myself, which is why I recommend letting the landlord deal with it. Good luck.