Since Bee has stated that this 4th attempt will be her last, if you have any chicks that are actual offspring of any of those broody hens that are being raised by the broody herself, if you could part with a few of those chicks, the chances that the little girls will grow up and be broodies are supposed to be pretty high (especially if the rooster was offspring and raised by a broody too) and Bee could just put them in with her currently growing chicks.
Just a suggestion.
I never expected to have 4 out of 5 of these girls broody by 9-10 months, so didn't have a good chance to get their own eggs added into the mixes they are currently raising. But their eggs will be some of the top choices we make for any future hatches we have with any of our hens... I am very happy with these birds for size and personality, they have been very pleasant to have in the coop!