I know children settle in well,
France just a better way of life for us and Jess
I know children settle in well? I won't tell you that they never do, but not all do. And actually we are not even talking about a child here, but a teen. All those links that NormanH kindly gave you, well she will have to know all that more or less by the time you get there are she should be starting 4eme in Sept 2012 and those links are 5eme's work.
And it could suit your daughter very well and she'll get her brevet and BAC etc. But it is late in the program for her to be going to college and learning french to that standard and your are right, she could well end up with no qualifications.
Would I do this to my teen? Mine were in the system and I wished I hadn't had them in french colleges. So, not in a million years would I do what you are thinking of unless I could afford to board them at a school in the UK or send them to a very good international school in France and they are not all 'good'. We are english, both children born and educated in France.
And a better way of life for your daughter? Lost for words really!
And health care, if you are not retired and not working, do you know the rules? I don't want to know if you can afford it, but you should be aware.