Wasn’t she pushing Christie on us just a couple months ago?
That was just a clever ruse.
She was always for Romney, and knew that Christie wasn't going to run.
That way when asked who she was for, she wouldn't have to say Romney until she was ready to "out" herself as a Romney supporter.
It was always Romney, even in the last cycle.
Only then she was campaigning for Hilliary until she decided the timing was right to push Romney.