Screw what anyone else thinks!
Please, please MOVE HER!
My DD went to a brilliant girls school in Y7, she became a shadow of herself, she found it 'cliquey', and would cry very night. Previously I never woke her up as she loved school, I was then dragging her out of bed.
I moved her in the first term, within two weeks she was back to her normal cheeky, confident self. She is Y10 now, and she still remembers what it was like and how much she hated it.
She will not have the self belief and confidence to succeed in her current school.
Your child's mental health is more important than anything else. Whilst you could approach the school, whilst you are doing that your daughter is being traumatised every day. Also remember with SM there is not a break from bullying. I know of a child that committed suicide at my daughter's original school last year because she was being bullied and the school were acting on it but was just to slow for this young girl.
I do really feel for you, I cried when my daughter would go to bed, as my heart broke for her 