On her call for Perry to leave the race, once Perry canned the Trans-Texas Corridor, his popularity started bouncing back. She may be looking at internal polling that shows her losing, and she's looking for a graceful way out. Perry lost popularity when he quit toeing the conservative line. People in Texas won't go to the left of Perry.
A quick note on Kinky, as he's been making noise about another run. Kinky is a joke with a couple of good quotes. You can get the equivalent of Kinky's platform by walking into the Mule Lips Bar, buying any drunk a double bourbon and asking him how to fix government. As proof, he said if he was governor he'd make Willie Nelson his energy czar. Willie's a seventy some-odd year old singer who's been stoned every day for the last forty years and who's only claim to energy knowledge is underwriting a fuel called Bio-Willie that as far as I know was sold at Carl's Corner and no place else. Carl's Corner is another Texas oddity. It's a Truck Stop that incorporated itself and became a town.