I have found the best way to manage our son's food allergies while at school is to maintain an on-going, open, daily-if-indicated conversation with the staff, including the teacher, aide, director and anyone else who might need to know, such as the after-school teachers. Each year, at the first parent meeting of the year, I give an allergy presentation to all staff and parents. Prior to this child, I can honestly say that I had NO idea what it meant to have a peanut allergy, how serious it is, and how SCARY a reaction can be for staff, kids and parents! So, I do not assume that any staff member or parent is on the same page as me. We live this daily, but other parents have other stuff on their minds, not my child's food allergy! And that is okay. So, I keep reminders short, polite and let everyone know that I am grateful for their carefulness.
Have you had an allergy meeting with this teacher and director yet? You should have a written plan in place. Make sure several adults are each properly trained to recognize signs of an allergic reaction and administer the Epi-pen. There is an RN at Children's who does free inservices on this topic.
We place a STOP sign on the door of each classroom in the school, since peanuts/tree nuts are not permitted in any classrooms. Each parent receives a letter at the beginning of the year thanking them for their cooperation. I include a list of nut-free snack ideas. Samples of peanut-free alternative spreads. Email me if you need more support or ideas!!