He hadn't even thought about the fact she's sitting up now until he thinks about it. He's glad she's capable of doing that at least, though he hopes she doesn't overexert herself.

He sits down down next to her while she brushes her teeth and they wait for Sherlock. He offers to take the cups back from her, splitting them so she can spit in the empty one, and sits there being a cupholder in the meantime.