In case anyone else is wondering. I ended up installing Carls better werewolf cheats mod to be able to just manually assign that perk (after having proceeding with trapping the sim for 24 hours and still not being able to unlock for her)

Has anyone figured out a good method for granted transformation mastery to a townie that isn't part of the house hold?   


I bite one of the NPC's and wait for the transformation. But I can't do any of the werewolf interactions with her because she doesn't have transformation mastery. I decided to wait and see would get it on her own but now I'm starting to wording if I need to trap her on full moon night to be able to grant her this ability.

NPC townie transformation mastery