It would be cheating. She wants to prove herself. Githyanki are cruel but not without some warrior's honour. Also giths have some psionic abilities and they may check if she's telling the truth.
If Larian intends it that way that she needs to honor her warriors way to her races way of life/tribe/clan/goddess.
It would be a nice touch to explore this and add a situtaion near the end of the game.
Laezel gets her story to fight a Mindflayer. Maybe her own tadpole removed and put into one Gith she really has a problem with.
So to speak, shes then fighting a Mindflyer who knows alot about her allready as it was hosted by Laezels own brain and somekind of superior, maybe another Gith Captain, Officer something..