Hey @Mumof3xbears!
I was your daughter once. Bright, really excelled and then one day BAM! I got whacked into the bottom set for maths (270 pr year and I was in the bottom 30 having previously been top 30)
There were a whole host of reasons behind my setting which aren't worth going in to now but my mum spoke with the school and told me that this was my time to "show them how awesome you are." Exactly as a PP said.
So I did. I could VERY easily have half arsed the work, dossed about and still been top in that class as the work started off being far too easy but instead I diligently completed every page, every question at my best pace and then took it to the teacher saying I was done.
So then came the week of "page 136, all the odd questions. Space, you do all the questions"
Completed that before most of the class had completed a couple of questions.
My teacher was very good. He had the bottom set with the difficult and struggling students because he was so good. So he took work from higher and higher groups and taught the class then after I had completed that work I had more to do.
I was working at the top set level within a half term.
He discussed this with mum and I. We decided to keep me in the class for the full year. I think that chucking me in another class would have been a searing issue but also, my confidence in my ability was rocketing under his care.
The rest of the class kinda ignored me. That was fine by me.
A at GCSE maths, studied physics and Chemistry A levels. What I'm saying is it hasn't affected me.