Aye, she most certainly lost it a bit. Not too surprising, given that everything she had ever known had been turned into radioactive debris and she and her crew were, as far as they knew, the only survivors.
Here's something to ponder, though. Is she really all that different from Adama? Remember back in the miniseries, when Adama and Tigh were discussing whether to just leave the civillian fleet to their own devices and make a last ditch revenge attack on the Cylons? Or how Adama at first dismissed Roslin's status as President? And while he never went as far as Cain did in his treatment of prisoners, he clearly had nothing but digust for them initialy.
Adama and Cain are in many ways the same person, but are travelling on seperate paths. Cain and the Pegasus are sort of a "Mirror Universe" view of Adama and Galactica, one that Adama could have very easily become.
"You've all been selected for this mission because you each have a special skill. Professor Hawking, John Leslie, Phil Neville, the Wu-Tang Clan, Usher, the Sugar Puffs Monster and Daniel Day-Lewis! Welcome to Operation MindFuck!"