I don’t have any actual experience of food allergies in my kids but I think schools are used to the usual ones - milk, nuts, fish, gluten. How severe her allergies are will determine their protocol e.g. if it’s severe and there’s concern of cross contamination than she probably won’t be able to eat in the cafeteria if it’s a common food that could be brought in by the other kids. And her classmates will be informed not to bring x food into the classroom. But you probably already know this, having dealt with it at her current school.