Hi emm, I have a Dd who is 10 and has separation anxiety. She has not had it diagnosed as it is part of her Aspergers.
She has struggles with separation all her life and when she is away from us she also worries that something bad will happen to us.
She is like your Dd in that most of her anxiety is based around me.
I have only been away for one night in her whole life and she has only stayed away from home alone twice.
Because of the aspergers she has great difficulty in telling us what it is that she is worried about.
She has an amazing SENCO at school who has had experience of this and who has really helped us in the last 12 months. She moved to this school recently. The old school were rubbish and just used to let her get so anxious that she vomitted and then they sent her home.
I think you should go to your GP and ask for a referral to CAMHS. They may be a long wait so I would do it soon.
Also speak to the SENCO at school and see how they are going to help your Dd.
It is part of the schools job to support children with special needs and this level of anxiety is definitly a special need.
Sorry this is so long and I hope some of it helps.
You could join us on the Special needs:children board, it is a really friendly place and there are a few of us with Dc's with anxiety type issues.
Good luck