I think Kristina Frye is the only character who had shown mental superiority to Patrick Jane (season I). Then they make her the victim (she is strong enough to act like she's crazy so people forget about her and she is categorized as a victim). She has disappeared for a very long time and nobody knows about her or what she's doing ... this seems very strange...  All in all I think she is the only character who had shown the mental strenght to overpower jane and she visibly likes to manipulate and humiliate him. I think she has what's needed.