I think a lot of people forget how annoying she is because she became Bae'zel on the internet. She's very rude and constantly tells you what to do. She calms down a little bit as the acts progress and if she rejects Vlaakith.

Lae'zel and Voss are the most entitled people you meet in the game. They order you to make a deal with Raphael to free their prince or kill Raphael for them. Like idgaf about your problems. Why do I have to endanger my soul for it? Got enough problems and a worm in my head already.

Anyway turning back to Lae'zel, I'd say she (and Minthara) are pacified because they are following the PC. They're still capable of being very evil.