What advice would you give to your child who is saying her friend brags all the time?

My daughter, who is 12, has been telling me that her friend brags all the time. She is friends with these twins, and in a lot of classes with one twin. She has been telling me that the girl is always bragging. The girl says things like “our house is worth $_____” and “my dad just bought a new car that cost $50,000” and “our dog is so beautiful and you never see those dogs in shelters because they’re too valuable.” If they have an assignment, and the girl does extra, she brags about it all day “I can’t believe I did 60 questions” or something like that.

My daughter said she no longer likes the girl but they’re in a small school and their circle of friends is small. Us moms are friendly so sometimes we do things together. My daughter asked me not to tell anybody at the school (administration). She said every time she turns around, there’s one of the twins. I told her to tell the girl that “we don’t have to talk about you all day” but she said she’s afraid of retaliation (they can be mean and do things like shun people).

These are middle class people, as we are. It’s not like they live in a mansion or anything, but apparently the girls have the idea that what they have is something that should be envied.