Ugh, I've had that problem before. Someone made a fake myspace of me which completely surprised me because I'm very modest about my looks. I don't think I'm the most gorgeous thing out there, especially not gorgeous enough to have a poser. But someone did pose as me, they even had old pictures (pictures that I deleted off of my myspace years ago) up. The worst part about it was the way they made me out to seem like I'm this sexual deviant, only wanting sex and such. I read the comments they had and the ones they left people, it disgusted me to see someone pose as me for cybersex. I messaged 'em and was like, "Wow, you look oddly familiar. Had no idea I had a twin." They never replied. The profile was so degrading that I had to report it.
Just tell your friend to report 'em and in the report, have her include that if it comes down to it, she'll even take a picture with her friend id to prove she's the real deal. The page will end up being deleted.