The Math Ain't Mathin'....
If DeeDee had MBP (Munchausen By Proxy) and was the one looking for attention and grifting from DAY ONE, the VISUAL timeline of when these things appear - dressed in princess dresses, eating "royal mash potatoes", mickey ears, new house, wheelchair and dolls, lookin' like a derpy idiot ... don't match up.
I CALL SHENANIGANS! It's likely the grift began about a year or two AFTER she reached double-digits. No doubt Gypsy likely would have been happy to "get stuff", "get attention", "be special" and Dee Dee would go along for the ride.
From what I can gather by the woman who had access to Gypsy's Life Rights, the con probably started about 2 years after she reached double-digits and the visual timeline seems to corroborate this.
I'm not claiming it's true, but when the math ain't mathin'...you get what I'm sayin'?