I tried to think of specific things Petra would be doing, but it's all boiling down to following Levi around like a lost puppy, which will probably last for a little while until she settles most of her sudden feelings about being dead and how all of her besties are dead, too. this isn't that different from back home honestly

But she'll also be staying (somewhere) in the Flame Building, and she'll start trying to make sure the kids are eating their vegetables, cleaning their rooms so Levi won't scold them them, and be a cool big sis to everyone--especially you, Eren--, and also helping out with whatever tasks Erwin needs to be done. She won't be too interested in school, but magic!! what is this weird stuff??