Agreed with above post by PD. Part of animal husbandry is making the decisions for the animals, including if and when, and how they are allowed to reproduce. As for next time, OP has had a lesson from school of hard knocks, and I'm sure the next time will go much smoother: Controlled clutch size, perhaps even giving broody her own small area so other hens can't enter her nest. Sometimes ensuing battles over nest and eggs can result in broken eggs. Marked eggs, all set at the same time. Until you set eggs, you can give her golf balls to see if she will stick to the nest. Don't set eggs till she's stuck tight day and night for 2 - 3 days.
Before setting eggs next time, I suggest that you have an incubator on stand by, running and at the correct temp. Read all of "hatching eggs 101" in the learning center before setting any eggs, either in the incubator or under a broody hen. If you become familiar with candling procedure and embryonic development, you could cull an improssibly large clutch of eggs by eliminating any late to the game or dead eggs early on. Or you could take 20 eggs away from her, and incubate them in the house, and leave her with a manageable sized clutch. An incubator can be made for about $20, using easily scavenged materials, and a thermostat.
Before setting eggs next time, I suggest that you have an incubator on stand by, running and at the correct temp. Read all of "hatching eggs 101" in the learning center before setting any eggs, either in the incubator or under a broody hen. If you become familiar with candling procedure and embryonic development, you could cull an improssibly large clutch of eggs by eliminating any late to the game or dead eggs early on. Or you could take 20 eggs away from her, and incubate them in the house, and leave her with a manageable sized clutch. An incubator can be made for about $20, using easily scavenged materials, and a thermostat.