I am just wondering why she is using your house as a hang out place?

it's like she is getting the best of both worlds...
you are making it too easy, in my opinion, to not have to deal with her decision to leave...since you really aren't having her leave.

Are you spending that much time at her house? I thought I read you hadn't been there yet

why is she then spending so much time at YOUR house?

it seems like you are sliding quite nicely into the role as really good friend/babysitter

is that where you want to be?