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Well, you're going to have a problem then. I see the parents there, they are the curly except for the chest ones I am assuming. The first thing I noticed when I looked at the picture was the lack of curl on most of them- I think they are as curly as they are going to get, if they are going to curl they do it early on, mine started curling at 6 weeks. You have two smooth chested parents it looks like. If you breed smooth chested to smooth chested you get what you have there in the babies, mostly regular feathering. You won't get curly out of two smooth chested birds just more like those babies. You will need to add in a curly chested bird (sex doesn't matter) then pair it with one of the smooth chested parents for best effect. That kind of a breeding will produce some like the parents and some that are curly all over. Are you aware of any curly babies being made by the them as a pair...ever?
Pips and peeps just mentioned she will probably have some males available in not too long, maybe she'd have a curly that you could get.
EDIT: At least that is what I have read and been told by those more educated then me. But please, ask some other breeders and get their input.