Boo's never been a chewer either. The rare occasion that he does, it is on something soft. Like the rope toys.
Gracie Ruth, on the other hand, is part beaver-part goat.
She'll chew on anything and wants to eat everything...wood being her first choice. Silly girl!
Perhaps hard items just aren't Jenna's thing. Have you tried the bully sticks Keep trying some different textures and maybe you'll find something she likes.