It depends on the symptoms. Avoid peanuts and peanut derived products. Also get her seen by a doctor so she can possibly get medicine for backup if she has a severe allergy.

peanut allergies can be very serious - if she hasn't already, she should see an allergies specialist but at minimum, she should avoid anything that might contain peanuts or peanut oil or peanut butter or manufactured in a facility that might have peanuts/peanut products around. She probably should be carrying an Epi-Pen for emergencies. You need to speak with your pediatrician and/or allergiest.