Who is the real Shu Ya Nan?

 roro4:

This is the first clue I remember he questioned her. She lied lol. She's a good liar. I believed her too. But I wonder how she knows Wen Cong??

Also she had made a comment that if she was a part of the Lingyuan sect that  would be a betrayal of her master. So what was the truth then?