That wouldn't stop me and I'm 73! First words out of my mouth when I fell and hit my head in Ft. Lauderdale last December was..,..."Oh no, they won't let me on the ship!" But they did, I wore sunshades and nobody noticed the huge hematoma dripping down my face! I didn't even go to emergency. Yeah yeah, I know...foolish. Nothing happened at all on the cruise, except we got a lot of weird looks.Give it time, she may feel great in 30 days. And there are free wheelchairs at all airports and you can order one from Special Needs at RCCL for arrival, rent one to go on ship if needed or just buy her one of those knee wheelers. I'm sure with determination it can be done. You Mom sounds spunky!
BTW, I just bought my very own electric wheel chair, if I'd been in it in Florida I wouldn't have tripped.