The vials are indeed labelled! It is relevant that these cannot be prescribed and given to patients, and her name is not on them. These are meant for a clinician's office.

Marjorie notices Wrench coming upstairs, but she also seems to observe that his hands are still damp from having been washed. She approaches, starts to open her mouth, seemingly remembers that he's Deaf, and points to the basement door, shakes her head, then gestures with an extended arm—down the hall—and bends her fingers at a right angle with her palm—and to the right: the location of the bathroom.

She smiles at him, puts a manicured hand on his upper arm, and excuses herself, but for the rest of the night she can be seen occasionally watching the guest who accidentally wandered into the basement.