Take a look at this :

Until He Decides...

I don't think there is anything particularly WRONG with it. Sure, it is outside of everyday accpted behaviour in society, but that doesn't make it wrong.

In my opinion, I think that because she's a single mom, she needs to continue keeping the emotional bond with her son as part of her life. Even though she keeps insisting that her kid can wean himself according to his own schedule, I'm sure she puts pressure on her son to not stop because she wants to satisfy her needs. Not necessarily sexual needs (although I am doubtful of that, I will give her the benefit of the doubt), but the need for closeness and belongingness.