If she had that kind of stamina, she could go for ages, and fight all of the corpses. So yes, it's impressive, to America.

"Thank you! I'll take care of any that come at us from the front!" She isn't going to be dead-weight here, not if she can help it.

It doesn't take long before she sees one of the villagers backing away from a couple of corpses. "There!" She rushes off to land a punch to one of the corpses, tar on her hands or not.