Pretty sure she just saw the dik helmet on MC's table, no one else was in the room with her. The MC finds the helmet broken the next morning so she most probably used itJust got a flash while people are talking about the box (since I thought that was the thing Vinny was searching): What's the consensus on who was in MC room? Most likely Vinny still searching for something in particular? Or the other guy working for Buddy, since Vinny didn't want to get recognize AGAIN (I don't really think he care, but he probably doesn't want to be seen by Quinn, Tommy or Lily).
I know she's dumb, but Arieth reaction didn't seem like it was someone she knew, just someone she found hot (and she doesn't have high standard).
Maybe Chen being angry that MC didn't let him push more for the threesome.....?