I don't know how my dd will cope with just girls as she despairs at some of the behaviours of some girls and by the time the school completes its expanding numbers it will reach a thousand pupils.
My real concern is that my youngest dd fits in and makes some friendships in her large school and that she will be happy.
1000 pupils is actually comparatively small in some cases schools have 3000 pupils
My older Dd seems to think that it is predominantly the mix of boys and girls at school that causes the nastiness, apparently children are bullied if they ask someone else's boyfriend for a rubber or even look at them. My younger Dd says that having the boys in the mix was what caused all the disruption in class
The bit about not having a uniform that is too big etc is so true for making friends. last year Dd had some rather geeky shoes (not the same ones that everyone else had), because she has sensitive feet and can't walk in the pointed toe ones (her choice). This year we had to go to the London and trawl the shops to get her a pair of acceptable shoes that are good for her feet and comfortable (not making that mistake again.) Oh and Lunches. I have decided to go with the flow at least for the first term. Last year I insisted on packed because there was NO healthy food in the school canteen. This year I will grit my teeth if she feels she has to eat in the canteen, at least for the first term while friendships are being made (she will pick the best she can, or I will smile and continue to make packed lunches if that is what is right for her.)
I wish your Dd the very best.