Try to avoid checking her profile on FB.
As a mother I find FB a major source of problems and conflicts between younger people; it allows drama to be perpetuated back and forth. I am sure that isn't was it was intended for, but nevertheless, people use it in that manner.
Disconnect from FB for a while and surround yourself with REAL people in REAL situations who are doing POSITIVE things. Passing "he said she said" gossip isn't the way to go.
"I also found out her family is saying that she's faking it so how do I tell my boyfriend about the pictures that I saw and what her family are saying?............Why do you think it's your duty to tell him any of this?
Hon, I would just drop this and not worry anymore about this girl. Let your bf find out on his own if he really wants to know or care. Sounds like you care more about this than him.
Bringing this up and focusing on her is pretty much wasted energy and negative and neither is good for you or your relationship with your bf.
I would be concerned if I had a bf who had to deal with these situations a lot. That says a lot about him. Just keep your eyes open about who he is and not just focus on painting these girls as being the bad ones.
I would recommend you say NOTHING.