if she already has intolerances it likey she could have additional intolerances. Peach and mango are high in salicylates - a naturally occurring food chemical. If kids are sensitive to them it is the normal food intolerance symptoms like mucus poo, frequent poo, tummy upset etc including nappy rash and red bottom. It sort of burns their insides if they have a build up of the chemical and the body is not detoxifying and metabolising the chemical effectively.
http://www.fedupwithfoodadditives.info/factsheets/Factsalicylates2.htmMy LO is intolerant to dairy/soy and salicylates as well as preservatives and additives. Not too sure about wheat at the moment but excluding it for now.
Is she has a problem with salicylates you should find problems after she has stone fruits, citrus, avocado, dried fruit, teething gel, olive oil, nuts, and most berries.