A messenger bag with very small quanties of items works well for me instead of a purse. This can help to keep your hands free.

Some texts are available via ereader I believe. I love my nook...

Getting permission to leave class 5 minutes early helped me enormously when I was in a leg brace in jr. high. If she's sensitive to vibrations, having her skip assemblies and getting special accommodations for lunch might be important as well.

The important thing is to make sure she doesn't hide the problems she encounters, but has someone at school she trusts will be a good advocate for her.

If she needs a free period to recover somewhere quietly might be something to consider. Or utilizing an online class here or there in certain scenarios.