Once again the entire world opened up to Genie. Every possibility at her disposal, with or without magic, was available to her. She knew exactly what her Master wanted, of course, was to own the mansion free and clear, and Genie could do that. And a part of her very much wanted to give her what she wanted.
But Genie also remembered how Claire had tricked her earlier, and the way Claire seemed to love lord oven Genie. So Genie could grant her Master's wish in such a way that the current owners of the house could force a legal battle for the house, and she could even time it to start right around the time of the wedding, perhaps ruining both.
But the last option Genie saw as somewhat viable was a loophole in Claire's wish. Her Master had commanded that she and her fiancee live in the house, not to own it. And this house came with currently unoccupied servant's quarters. With one snap of her fingers, Claire and Kevin would feel how it was to be a servant to another.
With these options laid out in her mind, Genie made her decision and granted her Master's wish . . .