Ravenna at full power can't be killed. She feels a bit of pain, but can heal from fatal wounds as long as she has enough youth stored in her.
She's not as fast as Alice, but she did display some pretty impressive strength and skill feats by toying with Snow White. Plus she can call on those dark glass monsters of hers at will.
I say Ravenna takes this as long as she has a huge storage of youth to heal herself from. Otherwise Alice has a good chance of depleting her energy stores.