I have a broody silkie. She has been on and off since December. She would sit on nothing. So I kept booting her out of the coop. But she wouldn't give it up. So I tried something new this year and I ordered fertile eggs off ebay. A dozen cochin/frizzle combos. My khaki Campbell duck laid a fresh egg so I stuck it under her too. Another new things for me. Yesterday I woke up to a fresh duckling. I was so excited. I had been candling it so I got to watch it grow. It was so neat. So far I have 3 chicks and a duckling. Can't wait for the rest to hatch.
Congrats on the new hatchlings... She must be a pretty big silkie if she was able to cover 12 eggs + a duck egg! How long has it been since the first chicks hatched? Usually if all eggs are set at the same time they tend to hatch within a similar time frame (usually within 48hrs from first hatch to last).... there can certainly be a 'johnny come lately' but after 2 days you would need to consider pulling left overs and placing them into an incubator to let the broody concentrate on the ones already hatched.