Well, I'd take the failed eggs out, and put fresh eggs under from one of the other pens.
I have no idea how I ended up with the broodiest birds ever... Its not even a silkie that's broody. Its a New Hampshire, Serema, Faverolles, and a mutt hen that I have no idea what she is.... The mutt I am trying to break though. She is a great sitter, but she is rather air headed once the chicks hatch and being winter here, I don't feel like raising them. She can have them in the late spring early summer if she goes broody again.
But, get silkies or cochins. My bantams cochins are the broodiest. They are both 2 years old and starting last winter, they've both had about 5 clutches each. One is raising babies right now, the other has plucked her belly, but then changed her mind I guess cuz she's still laying. That or the serema hen chased her off. Lol