Lae'zel is a terribly-written character because her personality revolves around one thing only.
Larian Studios wrote her and the githyanki as the Evil Yellow People, the savage foreigners driven by beliefs that are not only savage but stupid to even the most casual onlooker.
Lae'zel serves as the representative of Larian's outlook on Evil Foreign People, coupling racist dehumanization of others' cultures and beliefs with fetishization of "exotic" peoples. Her storyline involves her being "enlightened" by exposure to what Larian sees as "white" culture and society, as evidenced by how anyone who isn't human or elven is treated as The Evil Other.
At the end of the day, Lae'zel is a character written without a shred of what we would ascribe as humanity because she's written as parallel to people the writers of the game don't see as human.
