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What I can't understand is how they can set for so long without something to READ or some needlework to do. I would go nuts!
I've always admired the instincts & abilities of broody hens. I've heard a lot of discussion from folks who set eggs in incubators and have such difficulty keeping the temp & humidity at just the right levels. But a hen just seems to KNOW. She sheds feathers off her breast to make a nice moist pocket next to her skin. In cool weather she'll clamp down tight over the eggs, spreading herself almost flat to cover them. In warmer weather she'll set more upright over them. On one hot day I saw a broody hen standing up over her eggs for a while. They also time their breaks to match the weather, the warmer the temp the longer they can stay off the nest.
Your hen may not need much food/water right now, may not want to leave the nest for long, may not need to poop yet. I think she knows how & when to get up, I wouldn't bother her by rearranging her furniture. If your other chickens are comfortable in the outside temps this hen should be too. You may want to spread a blanket or sleeping bag over the kennel to help her keep her heat in while on the nest, but the rest of your set-up looks good.
You can try putting that one egg back under her, make a mark on it so you can see later if it gets discarded by the hen or doesn't ever hatch. And I think you're taking a chance to add 3 more eggs to her clutch, it's a chance that might be successful, but there's a chance it may be too many for her first setting. There's also a chance these new eggs won't be ready to hatch when the others do and the hen won't stay on the nest to wait for them. In my opinion, I wouldn't add new eggs more than 12 hours after setting the first ones. But it's up to you if you want to try it anyway. It just might work.
During the next 21 days, while you're sitting on your hands & waiting for your hen to hatch her chicks, be making plans for what you're going to do with all the cockerel chicks that hatch. Can you, will you want to keep any of them? It will be tempting to want to keep them all since you've been so personally connected with them from before birth, but that will probably be impractical. Have your plan in place now, and don't give them names until you know for sure they're ones you will keep. It's fine to enjoy & adore them all while they're cute & fuzzy & new, but keep in mind that not all of them may be staying with you as adults.