Tommy's getting Kate's patented Teacher Face (TM).

"What y'need is rest. Y'barely slept all night. I know, 'cuz I was there. An' with half the bar sick, y'can't expect it won't spread. In bed now, mister."

She pulls on his towel, indicating he better follow her or risk punishment. Once in the bedroom, she digs out some clean clothes for him to sleep in.