Laezel is not chaotic in my opinion.

She is devoutly loyal to her community and queen. Her priority, which is sane, is to avoid her and others becoming Mindflayers. If a the main character embraces the tadpole powers, she gets mad ... rightfully so !

She is evil in the sense that the lives of commoners or of anyone in the way is of little concern to her, but that is not chaotic, just callous/evil.

She can be somewhat flexible, so I would place her Neutral Evil, maybe Lawful Evil if she does not lie to her non-Gith allies.