E.P.
I've been a room mom for many kid's parties and, I'm always careful with children with Food allergies and asking the right questions. Many times, if there is a child with many food allergies like this, the teacher will already have a special "bag" of approved stuff from the parent, so please ask this question. Or...call the parent directly. Soy allergy can be tricky. The parents generally don't want to put others in this situation of having to come up with a solution and potentially jeopardizing the well-being of their child. It's very polite that you are asking this question. Many parents have been amazed that I have made that call - there are so many people who don't understand food allergies or don't ask questions about it and send an item in, anyway with the offending ingredient in the item. Good luck.