Maybe; it's possible she just wants to chill and get out of the media spotlight, and don't care about the presidential race. Either way she's out of it. So who right now would be most likely to get the Republican nomination?
Original Candidates like Mike Huckaby, Mitt Romney, Rudy Giuliany, a big R republican like Newt Giengrich, or maybe a State wide Rep. like, Bobby Jindal or Susan Collins, public official like Colin Powell, or some big name like Sean Hannity, or just a random conservative?

I don't know, at this point there is no frontrunner in the Republican Primary, even just speculative.