So sorry, that was an awful experience. Those nut allergies are very concerning,
I taught our daughter, to ask if nuts were in cookies, cakes, etc, when room moms brought goodies for the kids to school. Some of the moms thought she was just a fussy eater and said, "no nuts". By that time , we had Benadryl , but it as so scary. Now she has to watch, ground coffee, coffee flavorings, and so much more! Plus, she lives in an area, where walnut trees live. and if they burn or harvest....it is difficult.