I think I know the camp you mean and everyone really raves about it.
I don't think older DD's needs are as significant as your DS's, but she has always done fine at regular camps. I have always made them aware of her issues but as far as I can tell, it's never been a problem. She is doing a 3 week sleep away this year and that will be the first time she will have been away for that long. Previously it has always been one week sessions. One week sessions are the norm for things like Girl Scout camp at the younger ages.
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)