My MIl is a lovely lady, but very quiet and has simple tastes and does believe in quantity over quality.
Anyway a few years ago BIl and SIL invited her to Christmas dinner alongside SIL family. They all brought a course for a meal and mil was allocated dessert. She decided to go to Iceland and get loads of cheap frozen cheese cakes and vienettas. This wasn't about saving money it's just what she likes and assumed everyone else would.
SIL has mentioned that her family joke about it all the time. They thought she should have brought some fancy desserts and it's become a family joke
They have invited her again this year and again she has been allocated dessert and she plans to do the same thing. I can just imagine SIL rather nasty family nudging and laughing. I have tried to gently encourage to bring something different, but she keeps saying "it went down so well last time". I can't tell her that they where joking about her. She would be devastated. I really don't know what to do.