"I was happy to be of any kind of use." Her days are so monotonous now, and she hates feeling so powerless. The chance to do something has raised her spirits and she doesn't even care that she's helped someone from the other side. He didn't become injured in battle while pointing his gun at a son of the South. He was injured as a man in a city at its breaking point in some areas, and she can't feel guilty about aiding him.