yeah the "great psychic" she has recently appeared in astonishing x men. i am quite new to comics so i don't know when she first appeared but i first saw her in new mutants: E for etinction where she is refered to as xavier's genetic twin ( then he shoots her in the head but she's still kicking around)
IIRC, didn't Xavier spend about five or ten issues as a bad guy villain way back in the X-Men storyline? I mean super way back, like fifteen years ago or more. It is not clear in my mind anymore, and I do not have an X-Men collection anymore to go and look at to see for myself.
I recall that Xavier began to appear in his astral form as a golden armored villain... He attacked the X-Men and someone else? Man I wish I had my comic again. I cannot recall how they resolved that situation. I thought for sure that it was after the John Bryne era, and before Paul SMith took over as the artist full time... way back before Adams.
I thought he was normal until Jean came back, and then he was understandably more stressed and perhaps a little rude. I think they were just showing that he has a darker side, like in Astonishing when the Danger Room asked him "They don't have the slightest idea of who you are, do they?" and then he says "I like to think that Jean knew, Knew and understood".
Perhaps it is a reference to that, like he repressed the Danger Room in the comics and did the same to Jean in the movies. I'm sure that he actually helped her when she was in the mental hospital, with mental blocks and stuff.