Carol, for her apart, was completely unaware of what happened with Merle. No one had said anything to her about it. As far as she knew, Daryl's older brother was still on his own somewhere out there.
But when he mentioned shooting Mercy, her eyebrows rose. "She was shot?" She wasn't entirely sure if he meant he'd shot her, or if someone else had. But maybe that's why she'd been in the infirmary. She'd never said.