[quote=mnmom23Come to find out yesterday that the teacher/math coordinator -- who, importantly, is also DD's coach, the mother of one of her very best friends, and a friend of mine -- told the other students that the only reason DD was in algebra when everyone else was in prealgebra is that "her parents worked with her at home.""[/quote]
I suspect this is what she believes because, to her, there is no other possible logical alternative.
I don't think you can do anything about it without something annoying happening, socially.
I'm not seeing anything to be gained her by saying something to her.