Hen sitting on fertile eggs but only at night

With candling I can see the fetus and healthy blood vessels around it. I can also see movement of fetuses and even see the little black eye. I'm basing it on this youtube video I found that was very helpful: and it so happens to be on day 7, so very similar to my situation.
Based on that I have 3 "winners" and 1 "yoker" in the batch of 4 I got. Got 4 because I was told that the rate of success is about 50% and wanted a couple of chicks.
I think my girl is breaking out of her broodiness. She is just doing it differently than the others have before. Others did not sit on eggs at night once they broke their broody mood.
I went into the coop after dark last night and gently took the eggs out one at a time to candle them. When I placed them back, she rolled them back in place under her just like a brood would. So maybe if I manage to hatch those and sneak the hatchlings under her at night she would be ok with that, but not sure.
I do wildlife rehabilitation on the side with Project Wildlife, mainly songbirds and have many a story about adults not accepting their own youngs or adults adopting foreign chicks so there's no way to know for sure how it's gonna play out. My motto: prepare for the worse, hope for the best... From the conversation, I'm hearing that if my hen is not broody anymore she would not accept the chicks, but since she is still acting somewhat broody at night... I'll give it a try. I will let you know (if I manage to hatch those eggs. I have lots of experience with hatchlings, but not with eggs)

Good luck with your brood under the house! Let us know how that plays out.

I used candling technic from a youtube video called Candling Chick Eggs Day 7. According to that I have 3 winners and 1 yoker. I can see healthy blood vessels, the embryo and even the black eye. I can also see the embryo move.
I will try to incubate and hatch and sneak the hatchling under the hen at night (if she is still sitting on eggs).
I went into the coop last night after dark to candle the eggs, took the eggs one at a time from under the hen and place them back. She rolled the eggs back in place underneath her like a brood would, so maybe she still has a little broodiness in her.
From this forum I gather she might not accept the chicks if she is not broody anymore, but since she still acts a bit like it at night I will give it a try.
You guys might see another answer from me pop up. I had written a nice long reply and forgot I wasn't supposed to put a link in there so it's out for review. Oops.

Oh OK....they were/are developing....but if she's not sitting on them all the time except for a little break to eatdrinkpoop, and it's not really warm where you live, they may stop developing unless you get them into an incubator.

They are under lamp right now at about 100 degree. I'm going to the store to get more properly equipped.
Thanks for everyone's help! I will let you know how this turns out.

Hi all, I wanted to give you an update. One chick hatched! I had only one left out of 4 eggs due to a temperature snafu that happened early on. Hatching started last night (Friday), 5 days AFTER the supposed hatching day. Day 25! I candled the egg the 2 nights prior to make sure it was still good and could see healthy vessels near the air sack and a little bit of movement. We'll call this one a late bloomer. So really that egg was on lock down for a lot longer than it should have been, but it still worked. Chick appears healthy and pipping. It's still drying out right now. We are planning on going to the store today to buy a couple more chicks to keep him/her company, since it's not humane to raise a single one. I will not try to introduce the chick to one of my chickens now, none of them show any sign of broodiness and the one who started this whole adventure has started to lay again.

MadamePoule said:

Thanks for the welcomes everyone and your insights.
We have had broody hens before but they usually snap out of it after 2 or 3 weeks. Corvus was broody since late July! Definitely different personality and quick clucking sounds and all fluffed up. She was still getting up and eating a few times a day, staying healthy but we thought we would let her raise a couple of chicks. She would steal eggs from other hens even if they layed in the other nest box.
I think it's just bad luck she snapped out of it only 2 days into the intro of the fertilized eggs.
I've read the eggs can stay viable for about a week without incubation so I think that's why they are still good.
We are in San Diego coastal area, so it stays fairly warm during the day but the eggs certainly do not stay at incubation temperature.
My concern is that we would have to raise these new chicks separately and there's nothing certain about a peaceful introduction into the flock once they are old enough. Corvus is our alfa and she bosses the others around quite a bit.

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Your other questions have been ably answered by others, as usual, (you guys are good!!) so I'll just address one thing in case the eggs are indeed viable and developing and you do incubate them sucessfully. Brood them outdoors with the adults from the start. Yep, outdoors. I lived in San Diego for 9 years, so I have a pretty good idea on your climate, and it can more than work there if it works here in Northwestern Wyoming! Integration issues are negligible if they even crop up. I usually achieve introduction at 3 weeks and full integration by 4 weeks. Make sure you have more than one feeder and waterer, which is where many issues crop up, when you fully integrate and watch Coruvs, but I've never lost or had an injured chick yet. And welcome to BYC!!

https://www.backyardchickens.com/a/yes-you-certainly-can-brood-chicks-outdoors

I have a hen that lays on her eggs all day but but will sleep on them. Will she be able to hatch them or should I pull the eggs. Also it gets in the low 50s at night