Incidentally...even when I suspected she may be lying to me last night, I was not real upset. I think I may actually be dropping the rope. Last week, my perceptions of her possible deception drove me insane. I thinks that's good.
It's very likely that she is lying.
It's also extremely likely that there's not much you can do about it -- she will do what she will do. All you can do is enforce your OWN boundaries, and not HER behavior.