I agree too about no school being perfect (and in every school teachers get ill/pregnant/have horrid things happen to them) and about not rushing kids to decide on careers - I suspect that is going through the motions to appear impressive, because in the long run I think it will be counter-productive as it is such an unholistic approach. How can you decide where you will fit into the world, when you don't know yourself properly yet?.
With homework, I've tried to help in ways that set the dc up better for the future, so help with organising revision and filing, fitting it in to allow time for fun, cheerful company at exam times (hah - that one's tough at times!), talking through anything tricky and when they were younger occasionally doing (very badly) their wonderful make a medieval weapon project.
BTM, my dd is lopsidedly mature too.
MrsS, do you get the sense your dd really likes her friends or is there an element of insecurity or indifference there? That is another pressure on teenage girls I think - the overtly close friendship thing - it is not everyone's bag......
I can completely see why you are reluctant to move schools. Is she about to go into the sixth form? Such a lot of dc move at that stage - has she asked to move, and might her her friends thinking of it?
MI, your cousin does sound great. I am sure if anyone can navigate the system you can, but wtf should you have to.....?. Anyway, I hope things gradually slot into place for your dm and that you can find some time for yourself.