what would evil lup do if she found herself tied up and without a spellbook having to listen to the THB bickering constantly?

Play on their very evident social and mental weaknesses.

Like how it took all three of them to take her down, when she was already weakened.

Lady is probably very perceptive and can see the cracks between Merle, Magnus and Barry. How they seem to fail at working as a team under most circumstances.

Maybe she knows Merle’s got kids. Maybe she knows about Julia and Ravensroost. Maybe she knows how lonely Barry is?

Regardless, they may think she’s unarmed but they’ll be so wrong.