so solve the problem and skip the long wait... give her a few chicks to mother.
I've discovered that some hens given babies will stop sitting and be good mothers, other girls try to act motherly but fail horribly, and others run screaming and start laying again within a week. LOL
my one 'good' momma, well great actually, is my buff orp. she's already on round 2 of chicks. she's got close to 30 right now. (again). assorted ages this time, not all new babies, and is once again doing a very good job. she'll get to go out in the pen once i'm done with this weekend's radio event (field day) and I have time to think clearly. LOL
a hen doesn't need to sit for a whole 21 days to be a good mother. orpingmomma sat for about 10 days the first time, and less than a week this time (if i'm remembering correctly). I don't trust a hen to incubate and not lose her nest or scramble them 'protecting' them from other girls, or whatever. tho one of my dorkings did the 'wild broody' pretty well, parked under my deck (that sits about 8" off the ground) directly under my door mat. LOL hatched 9, I lost 1, we had 3 stinkers. but for mothering, she stunk. she just wanted to sit on the babies, but did little or no interaction with them. orpingmomma talks to them, shows them how to eat, drink, scratch, etc. essentially she's teaching them how to BE chickens...
if you can find a hen that is a good momma like that, she's worth losing a few eggs over. and it saves a whole LOT of brooder headaches. I can put orpingmomma outside with this bunch probably Monday or Tuesday depending on weather, and she'll have them free ranging in another week or so, and going to bed with the big chickens in another couple weeks, all on her own. she seems to know when they're ready to start roosting and not huddling under her all night.