I would bring the dinner, but not make her explain why you brought your own dinner. She'll know, but no one else needs to know she was being a scroge.

Becuase in the end she did say she would pay your way & you did refuse, so that'll make you look spiteful.. which isn't good either.

So just bring your own dinner, refuse her money politely (say you don't want to be a mooch), & enjoy your dinner with some pie


That'll get your point across to her, and you wont look spiteful