This is so terrible.One of the first effects that will be noticable are the teethe.Benedryl destroys the teethe. If this is already present you have something to start convincing her.This is also doing irreprable damage to the liver and kidneys and nervous system.If you google the dangers of antihistamines you might be able to find some more back-up.You can also try contacting mothering magazine.They have an extensive library on childrens health and are always lending great advice to benefit the well being of a child.