Okay, so she doesn't need puppy food! Just pick one good, basic nutritious food (everyone has her/his favorite) and use just that. When she gets hungry enough (NO people food, remember) she'll eat it. Any chance of checking what she ate in her previous home?

Anyway, welcome to Pet Talk. I know it'll be hard resisting giving her people-food treats, but it's important right now, while you are both still getting used to each other, and setting the ground rules.