After all, “They” were coming to get her. And just her, according to her brother. Little old quiet and catatonic Barbara. Plain and frail Barbara. That’s a lot of trouble to go through for one girl. “They” could have gone after any other gal in the cemetery. But no, “They” chose to get Barbara.
And the best thing to do when the living dead select you is to run like a cheetah on speed.