Originally Posted by Water_Bear
Sort of? She had a pro-Evil upbringing, though she was nice at the time, but they a) introduced her to her husband the future BBEG and b) basically abandoned her (a 12 year old girl) in the wilderness of another planet. So definitely not the sole cause, but a huge push in that direction.
On the rare occasion that it happens, it's nice when the players unwittingly cooperate.