If she's been sleeping for seven hours and you can't wake her, she's probably hypoglycemic. Try to get some sugar on her tongue or gums asap - pancake syrup, Karo syrup, jam, etc. Then you need to take her to your vet as quickly as possible since she's been out for so long.
Here is some information:
http://www.marvistavet.com/html/body...oglycemia.html