>>/6265/
Pure and utter denial. She does not possess the life experience required to realize what the hell is going on. We have to cut her some slack, considering her age and inexperience with relationships.

But yeah, she does not seem to grasp what a predator she is with. You half expect her to get it one day when she comes home and finds him with some young girl in ther home, if it ever got to that point. 

In other words, it's not that she doesn't get it because she's dumb. It's because she does not have any experience. She's has a classic case of "they just don't understand him like I do" syndrome.