Quote: ... a hen sometimes has hormones take over and she will 'go broody' and will want to set on eggs to hatch, then raise the chicks.... usually a hen will raise her chicks till they are 5 to 8 weeks old, teach them about being chickens and then she will 'wean them' and she will return to roost with the other adult birds of the flock and leave the youngsters to fend for themselves.
After she returns to roost with the other adult birds she will begin laying again and return to her normal chicken behaviors. She may not have the hormonal urge to go broody again until the next year... or it may be in another 4 weeks, it depends on the bird. Some birds are broody once and never again.... there is just no way to tell.
You can't force a bird to lay eggs, they do it based on their hormones... you can't force a bird to go broody... again, it is hormones... and you can't make a bird stay with chicks past the time she feels she should leave them.
There are many wonderful reference books which may help you understand the basic ins and outs of chicken ways... many are offered here on BYC...
http://coopedup.net/buy/index.php?route=product/category&path=43