If the environment is right she will - and she will win.
If things are looking rosy in 2012 then I don't think she will run. To do so would be suicidal - just like McCain in 2008. He never did think he stood a chance which is why they freaked out when Sarah came out with guns a blazing. I don't think anybody told her that the plan was to lose.
Maybe they did pull her to one side at some point to whisper that into her ear - and she most likely told them to go to hell. And with that, the persecution of Sarah from within began. And it still continues today. But like she says - she has their number.
One thing I do know is that no matter what, she will make the right decision at the right time. She's one smart lady