I think you use a big brush to tar a lot of people blackcat. But in the same breath, there are also many people like that the world over, here in the Uk also.
Take your time and build trust, if she lies, then the lies will surface soon enough. Personally, I don't see the point in renting somewhere, unless she is living on the street right now, but I am sure she lives with her family, so why would you even bother?