Why is she back?

Bill, get your own funeral. You see, this thing, it kills the real p… He's always picking on me. That you'll be with me in spirit this su… Okay, I'm walking down the hallway towar… He moved here about a month ago. Attention all travelers! Please welcome… Timmy and I are going zombie. Come on, your parents can't stand me. He's the one you should be scared of. Apologies, I ran out of shit! You two go on ahead and catch the church… You're ready for the worst? Better than focusing on walking corpses… Yeah, as long as we have the power of po…