Well there you have it -- she must be crazy. I can't believe she'd have the audacity to disagree with your point of view.
I'd start with this:
Comments: House Speaker Nancy Pelosi: CIA Lied to Me - ABC News
When a sitting speaker of the house accuses a federal agency of a felony crime, then decides she doesn't want to talk about it anymore the next day, they are showing their nutjob behavior.
I don't find anything implausible or inconsistent in that. What happened in one day? She got the riot act read to her by someone. I find the remarks by Republicans in that article far more disturbing, especially:
"It's outrageous that a member of Congress should call a terror-fighter a liar," said Sen. Kit Bond, R-Mo., the vice chairman of the Senate intelligence committee. "It seems the playbook is, blame terror-fighters. We ought to be supporting them."