Unless you have been defrauded, you have no standing to press either criminal or civil charges. If you know anymore that has been defrauded, you could relay your information to them, but whether or not they chose to press charges would be up to them.

Oh my, can you immagine being so unhappy and lonely that you would resort to lying about cancer to gain attention. My suggestion would be that you pray that this poor woman gets the help and love that she is seeking. I can't immagine any personal gain to be made by claiming this. Unless you're her doctor, I'd drop it and see if you can bring a smile to her face by sincerely asking her what you could do to ease her burden, for as you say...."You're very close to her".

You could offer to research her type of cancer and recommend WhatNext for help with any questions she may have. Also, you could accompany her on her visits to her oncologist and be there with her for moral support. Be a friend and advocate for her as if she is fighting cancer. Treat her as if she is a cancer survivor and perhaps she will realize what a true fighter must endure day to day.

Report your suspicions to your insurance commissioner so they can proceed as needed.
Fraud eventually costs all of us.

Who is she defrauding ?

What is she doing to defraud? is she claiming she has cancer and no insurance to get donations? Really curious to know the details.

That is so awful that someone would do that!! I am shocked the police won't help, isn't it fraud?

First, how do you know she is being fraudulent? Did she tell you outright? If so, you could stand up to her and even threaten to report her. I wouldn't want to be friends with someone who would do that, so you'd have nothing to lose. However, if she hasn't told you this...don't assume. Medical records are personal and private,and she could actually have cancer! If don't know for a fact, be wary and watchful. If you do know for a fact, try to get more info, stand up to her, and report your suspsion to whoever she is taking advantage of.