... there's no atonement on Jean's part. She reaches a kind of personal mini-catharsis, which is nice... for her. It doesn't do anything for the family of the guy she walked into traffic, or the thousands of people who were possessed/frozen and subsequently traumatized by missing time, or who knows who else was injured in the armored car chase at the beginning.
I'm not even saying that makes Jean irredeemable. But the movie doesn't appear to think redemption is all that necessary, and even if it did, is the X-MEN movie going to spend screentime rehashing what Jean did in BRAND NEW DAY so that we can see her become a better person? I doubt it.