The thing is that from Emma's perspective the girl cleaning the plexiglass is a brainwashed empty shell and this is a golden opportunity to destroy something that belongs to the fae who imprisoned them both and presumably killed whoever the cleaner used to be. Emma grabs her and slams her head into the block of plexiglass over and over and over, long after she's stopped moving and her plastic mask is cracked and there's blood in the jersey cloth at her temple, and then for good measure Emma tries a magic trick that probably won't actually remove either of them from this universe but it would be good if it did.

Valerie is not actually brainwashed, a girl, at all inclined to object to Emma fighting back, conscious, or, now that the magic has happened, still in the room with Emma.

There appears in another universe an unconscious person wearing a white-plastic-and-jersey-cloth mannequin suit under a black and yellow latex outfit and a gold belt with long light decorative gold chains that attach to gold wrist cuffs.