Dreaded food allergies

Sunday Reese-Kathryn had a reaction to peanut butter. It was just a bad rash and went away with Benadryl. However, I took her to the doctor today and he suspects she might be allergic to milk, peanuts and soy!!!! I'm not really sure what she isn't allergic to!!! We are going to have her blood tested in a few weeks and she will be off all of the above until further notice. If anyone has any ideas on what to feed her, please let me know!!!