Last year, when the teacher left the room during a test, one student turned around and asked two people the answers to a question. They were dumbfounded by that and just ignored her request. I had finished my test and had left the room, so I wasn't a witness, but instead of reporting her, they just talked about it with everyone else. Finally, I went to our teacher and didin't reveal any names, but told her that I didn't see it but others did and they don't know what to do. She told me to encourage them to tell. They didn't that time but it happened several times after that and several of us reported it. No teacher ever saw her, so even though they believed us, they didn't feel like they could do anything. This person also has no business being a nurse. She has a purse full of perscrition meds she is always offering to us for a simple headache and a hyperactive son who is always swallowing something toxic or falling from some amazing height. He also put his newborn sister in the tub with him and drowned her when he was two, so we wonder, "who is watching this child?" She was ostrasized (sp?) quickly and finally flunked out of Pharmacology Math and hasn't been heard from since. Our school is very prestigous and holds honor up in the highest esteem, but they were also between a rock and a hard place. Oddly enough, she was really good with patients when clinicals started. But I digress.
If this classmate of yours has to cheat now, she will feel the need later, believe me. It gets harder and she will either be found out or flunk out, so do what you feel is right and be patient. You have done the right thing. Hang in there and be extra careful, now that this has happened, to keep your nose clean in every instance and avoid even the illusion of impropriety.
God bless you!