Actually, take nugget's suggestion. Don't even let her in, keep her at the door, be respectful, nice all that diplomatic stuff, and stand your ground, it is YOUR life not hers. Return the books to her too. Don't give her reasons why you're stopping, just say it's your decision and thank you for enlightening me about your religion.
I know people here would love to turn this into an effort to try to show this dub something to make her question her stand, but it's not worth the effort. The mind-control will kick into overdrive if she hears your doubts/concerns.