Seems like a pretty one-sided article to me. Bryony Gordon's article is a based on a sample of one - herself! I think if she looked a little deeper she'd find a multitude of well-adjusted and successful girls with very happy memories of their school-day in an all-girls environment. You can't lay all the blame on schools for girls mental health - now that we're parents perhaps we should look a little closer to home? Get some advice, do some research - try
http://www.mydaughter.co.uk for a start....