Useful perspective. Garden pea is going up to have a chat. I recognise what your saying about blowing up out of the blue, and it usually being something that's gone on during the day.
KEHGS seem to have a brilliant buddy system, but hopefully WGHS.
One of the things that is unfortunate about 11+ is that it divides those into those that are succeeding and those, not. There has been a significant uptick in bullying behaviours over last few weeks. I really think DD needs to "woman up" and handle things a bit better. When you look beyond the digs and behaviours, a lot of what is going on is other girls trying to reassert their value and place in the world. Some are doing it using colour, others perceived prettyness.
The truth is the very best schools build pupils self confidence, regardless of arbitrary exterior characteristics. The reality though I guess was epitomised by the man who went on radio wm, for the 11+ discussion on walsall results day and said 11+ doesn't matter as the ugly ones will always do worse.