You're not supposed to move. You sit there and channel your aether towards her. There should be some kind of cast bar or something that appears to show you the progress of it. Just click on it, and wait for the animation to finish.. it'll automatically kick you out of the locked position and make you start fighting again when you've done it.
If you're still having problems and you can't move after a length of time has passed (give it 30 seconds or so)... then you may want to try talking to a GM about it because there's something bugged with your game