1) She's going to have to stage her injuries. I'm thinking kidney damage via punches in the small of the back, with some help from a friend. Would it be plausible for those injuries to keep her in the hospital that long? She'd also have assorted other bruising, a couple of cracked ribs, and generally look very beaten-up.
2) How will the hospital actually treat her injuries? Procedures, medications, etc.?
3) Besides bleeding into her abdominal cavity and decreased excretory function, what else might result from having damaged kidneys? I've googled various combinations of "renal trauma boxing punch", but nothing useful has come up.