Thank you, both - that's really useful and helpful information.
What you say is kind of what I expected. I know it's not a great age for us to do this and originally we thought we'd be moving after she had finished her education in the UK (to age 18 anyway).
However, events are overtaking us and aren't completely within our own control.
Her education is important and I do have concerns. On the plus side she's good at languages and we'd all start learning Turkish before we came so hopefully she wouldn't be completely clueless...of course, she would learn more quickly if she was younger.
There are members within our extended family who have moved to other countries and done well against the odds, and others who did terribly during their formal education in the UK but as adults have gone back to college, gained qualifications and got decent jobs. This makes me hope that, whatever happens in Turkey, it won't necessarily set the scene for her future. In years to come there will be money available for her to return to the UK and study further should she wish.
I do think there's more to life than exam results - I know graduates who are stacking supermarket shelves because there are no jobs, while my own son - almost 20 - abandoned the career he trained for and is now doing quite nicely in club event promotion, in spite of having no formal qualifications in the sphere.
Sorry - this is long and waffly and I guess I'm just trying to reassure myself.....hoping the life experience she will gain will prove equally valuable.
Shame about the subject focus, though - she loves her art and drama and is definitely more of a creative.... Maths isn't her strong suit, though she is excellent at English. It's a family trait.