L.G.
Remember that each time she is exposed the reaction will be worse. A lot of items are "manufactured in a factory with tree nuts". This can be important when checking labels. Of course, you will need to do your homework. However getting other people to do theirs is another thing. Plan on educating other people about this in pre-school. You may need to send separate snacks to parties and trips because no one will be there to check the "box" on whatever cookies or other items they are handing out. Since she's younger your teachers will be able to handle this somewhat when you are not with her. My son didn't find out until he was 10 and it is tough for him at school functions with sweets or even birthday parties where almond or other nut extracts could be hiding in cake batter. Best of luck!