I think there's about a 30 percent chance she will get out of the race this week.
A more likely option is that she will mount a pro-forma campaign -- win West Virginia and Kentucky -- and then get out on a positive note. This scenario may help cement her status as the presumptive nominee next time around (depending on how things pan out in the general election).
The idea that she will mount a serious attempt to "steal" the election from Obama, via superdelegates, is sadly becoming less and less realistic.