I wouldn't be so quick to discount her injuries. Ask anyone with a nagging back injury, some days you feel like an absolute champ and can throw a damn tree, but other days you're bed ridden from pinched up nerves. Thats just the nature of the injury.
I had a friend who got into a car accident, driver drove off a bridge. She's got a permanently fked up back. But you'd never know it from looking at her. Some days she's out and about playing football and cycling, other days she'll take 2 hours to get out of bed because the slightest movement will leave her in tears from her fked up vertebrae.