If you want to try to prevent them from laying more eggs you can apply some hormone control techniques:
http://www.littlefeatheredbuddies.com/i ... mones.htmlBut if she's already eating more calcium it might already be too late, and since you have unweaned babies you can't apply the hormone control too drastically because you don't want to dampen them down so much that they stop feeding the babies. I've found that the best time to start working on next-clutch prevention is when the oldest chick is about two weeks old.