What about the healing power, but she can pass the injury around. She can take it herself, or, store it and give it to, say, an enemy.

The catch is it has to go somewhere. This will explain why she maybe isn't tempted to go touring the world healing cancer and such (because it has to go somewhere) but in a battle it works? Maybe that is too inhibitive...? Could be done over a distance? A limit about how many wounds she can store and how long?