You can definately tell by mid movie when she was using her powers that she was tapping into the "pheonix" powers. The flames in her eyes and such. Not to mention the fact she basically tore apart that dam when she repelled Cyclop's blast.
Sure, they are f'ing with the comic story lines, but it was damn cool to see her hold back that wave and even control Profess X like that.
While we are on the subject...was it just me or did the quick scene where patrick stewart was being carried out of the compound, they find the chopper missing, and one person hands off patrick to another guy just a little gay? It was highly femmy move he made when he gripped the other guy around the neck.
Not to mention when Jean was controling him and speaking through him, it looked like X and Summers were going to have some kinda goodbye kiss. :Q