Same filter
Little hard to judge since I've never done anything like this before. Lilith and Alastair weren't exactly the chatty types.
Okay, well a spell would probably work better than a potion since well a potion would be drunk and Ruby's technically not connected to the digestive system of her host. A spell would target the demon specifically. Then I suppose it would be a case of if she has any mental shields that a spell would need to push past and if those are natural or the effect of any spells she may have in place already.