The player PC seems older and more experienced than she is. We can talk about having been to Tu'narath, where as Lae'zel says she's never been to the Astral Plane before.
She also doesn't know how to say tiefling, something Githyanki have special dialogue on to explain to her. And the Gith PC can talk to the dragon-knight without offending him like Lae'zel does.
On both my Gith playthroughs I got the distinct feeling of being someone in his 30s hanging out with someone in their late teens to early twenties. Lae'zel acts like she's a fully matured adult but she's still very inexperienced in how adult life actually works.
Huh, interesting. Thanks for the insight. I haven't played through as a Gith yet.
Her being ~20 definitely matches her character...still doesn't rule out her being somehow extra knowledgeable, but definitely makes it less likely.