Should I pay to have my sitter's couch cleaned?

So the other day I dropped my puppy off at my sitter's home for daycare. She was acting totally fine and normal, but apparently threw up all over the sitter's couch during the day. I obviously wouldn't have left her in someone else's home if I knew she was sick, but it was out of my control.

However, the sitter is now asking me to pay to have the couch professionally cleaned. I kind of feel like that's her responsibility since she volunteered to have the dog in her home AND on the couch. But I don't want to be completely rude if it's something that's expected of me. Any advice is welcome!