She's doing her job, implementing her boss' foreign policy. I do think she's in total agreement, but the demand for a total Israeli withdrawl from the West Band, and the ceding of a Gaza-West Bank corridor comes from GWB. And America.
The truth is as you say, except that while the directive may be from GWB it’s not from the USA version of America.
Stiff Right Jab: Bush’s ‘America First’ Foreign Policy
http://www.freerepublic.com/focus/f-news/957547/posts
Although these remarks by Rice are of some concern, I don't think they are all that disastrous as you seem to do. Remember that she's on an Arab language broadcast, so she's playing up to an Arab audience. She figures, for one thing, that it may sway some opinion in the Arab world more toward the US - but she'd be dead wrong on that.
She is also seizing on Olmert's extreme spinelessness. I don't think she would ever use the word "occupation" with respect to Israel if a tougher Israeli government were in place.
And she's still leaving the final status up to the parties themselves. Of course, as long as Olmerde is still in office, one can't tell how irrational Israel might be in ceding land.
For the record, this is not the first US administration to envision a "two-state solution." That's exactly what would have happened if Arafat had not (fortuitously for Israel) backed out the deal that Clinton had led Barak into. Chances are that, contrary to what the current Administration has in mind, Abbas would do exactly the same thing if the "roadmap" progressed that far.