President Bush's spokesman, Scot McClellen is her son. If the President and Senator Hutchinson weigh in on her side, she could win. Don't think both of those are likely though. I think the President will stay out of it.
OTOH, Perry has made a shambles of Governor Bush's education reforms, even before the Courts through out "Robin Hood". He's also PO'd several major constituencies that supported Bush.
I really ought to give up predicting, this mess has surprised me a couple of times already. I think I am safe on this one; no way does Bush jump in the primary race. Hutchison caught me looking. She had hired the likes of Terry Sullivan and former RPOT executive director Chad Wilbanks, just the sort of hired guns one wants for a "brutal" campaign. Then we have public criticism of Perry, all pointed to a challenge. Reelection to the Senate she can get in her sleep, why the heavy hitters?
Perry must think he has some sort of ace in the hole to call the session with no hint of a compromise between Craddick and Dewhurst. A lot will depend on whether he actually accomplishes anything beyond disrupting legislators' vacation plans to no good end.
Texas has survived worse governors than Kinky Friedman.