P.M.
Wow, Jan, that is a lot to handle all on your own! I am not quite sure what your questions is. Are you wondering if you should go back to school? I would, in your situation, call the school and see if you can take a few online classes this year. That way you can still be home with her and can still get to the hospital for all her medical needs without missing tons of class and throwing your GPA into the ground.
Also, I would REALLY encourage you to find a local support group. Call your daughter's hospital and see if they have any support groups for parents of chronically ill children. Most of these groups let your bring your child with you to meetings if you don't have a sitter and you would be amazed at the amount of support parents can give one another. Good luck Momma!