because the rash is all around her head and nowhere else, I really would suspect moisture as the cause.. I don't know how old she is but since you're just working in the solids I'm going to guess the 6-7 month range.. that's a really damp stage. just keep her as dry as you can, dust her with corn starch.. call the pediatrician and see what you can use on her (my youngest baby is 16, they change what's "right" so often I'm sure everything I was told to do beyond cornstarch is "wrong" now.. so call the pediatrician). unless she already has allergies I think I'd start with the regular doctor before I jumped over to the allergist..
anno