Perhaps her cage has been rattled a little. But that only makes her bitter and twisted. Insanity is a point of view after all, Kreia believed in something opposed to what everyone else in the galaxy believed - so she is defined as a few bolts short of a droid. But back in the old days I'm sure they called the guy who said the Earth was round insane as well!
That they did. As I said, it would be wrong to call her insane. Her philosophy? yes. But not her. Maybe she's just misunderstood. She is motivated, we can give her that.