Your DD sounds exactly like mine! I see how far ahead she is at home (and she also tests high), but when she is asked questions in school she replies "I don't know" and underperforms. She also complains of being bored at school, so then I look like an idiot when I advocate for her to have more challenging work despite her not achieving the work she is doing:( I would suggest finding out why she is not performing at her level. For my DD it is because she is shy and wants to just blend in with everyone else. I see other kids who think it makes no sense to do work they learned years ago (can't argue with that logic!!). Maybe working at the level of why she isn't complying would help, then you would have more traction with her teachers.
