I had two EE'er broodies at the same time (no rooster). I gave one of them fertilized eggs, the other EE'er got golf balls. I ordered chicks to be delivered about the same time as the fertile eggs were supposed to hatch. I put the chicks under the EE'er at night and removed the golf balls, she was a fierce mother and I had the bruises to prove it!! The other EE'er hatched out 6 of 7 fertile eggs and was a great mother as well. I had hoped my Silkie would go broody but at over a year old she shows no signs of doing so.
That was a couple months ago. Right now I have chicks that I ordered and one of the former EE'er broodies comes to visit them every day, eats, makes a fuss over them and then leaves. They were the absolute best moms. I bought some Cochin chicks so I'm hoping for more broodies next year.