When you use the tadpole on her after interrogating Zorru, you learn she views you as already a monster. Purification at the creche is a subject she dodges when questioned on, but later on when she mentions needing to be cured to the Kithrak, he basically looks at her stupidly, so I'm not sure what's going on. For me that only makes finding out what'll happen at the creche more interesting.
I think because Lae'zel is the first companion people get, she sets your expectation about what the Gith are like. We don't personally see the Gith contradict it before the fight.
Hmm basically what I'm saying is Lae'zel is the Imoen of BG:3
