Nope, we won't know until later.
Everything I've heard suggests Daniel Hernandez Jr. held her brains in at the front with his hand, and (inadvertently) held her brains in at the exit wound against his belly as he kept her upright in his lap so she wouldn't asphyxiate on her own blood.
Maybe the bullet went right down the division between the two halves of the brain, barely nicking either. But I'm not betting she'll be riding her bike again. I'd love to be proved wrong.
I'm very glad my taxes (and yours) go to provide lifetime healthcare for members of Congress. She will need it.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson