Why would you care anyway if she has a boyfriend or not, just fvck her.
This.
It sounds like you arent looking for a relationship, which is good. One thing that you need to realize is that women will use dating sites and real life to line up the next dude so they can make a clean monkey branch move from the current dude.
And that is ok. Its just how women work and I did this a lot too before my rotation.
I think you need to invite her to come over to YOUR place to make dinner or watch a movie ASAP. Fvck this chick into an oblivion and then let her decide what she wants to do. Hopefully she will come back for more, again and again.
Dont put pressure on her. If she does have a bf that she wants to get away from, chances are he isnt pounding it anymore and hasnt been for a while.
Putting pressure or mentioning her pics with the dude will only run her off.
Just relax, invite her over and have fun with her.
Chicks are only borrowed and never owned.