So sorry to hear that. Yup, it can happen. I broke my tailbone years ago, and there isn't much they can do besides PT and meds. I'm sorry to say it took a long time for the pain to abate.
Please remind your daughter it is OK not to be Superwoman at a time like this, and it is OK to ask others for help. In fact, if she doesn't ask for help, she is depriving other women of what we do best - become a community of supporters and helpers in time of need.