Sorry to hear about the string of bad luck -- especially her back. Back problems can be killers...
Hopefully she takes it slow and keeps up with the therapy even after the doc discharges her.
I do stretching and strengthening exercises for my back every morning. It's not a doctor's order. Rather just a simple case of having learned that I have two choices: do the exercises or sleep in a recliner because I can't get in and out of bed.
Best of luck to her!