So sorry to hear of the loss of your fav silkie & chick and your sweet rooster.Lots of updates here, both happy and sad. I'll get the two sad updates out of the way first.
First, my wonderful Silkie roo that I posted about a while back passed away. I believe that it was Marek's, though I can't be sure. He had been progressively becoming more lethargic and paralyzed in his legs and tail over the course of a couple weeks. Finally, after several days in a row of not leaving the coop at all and being hand-fed, I decided to end his suffering.
Next, and this one is even more tragic, I had a predator attack last week which resulted in the loss of my favorite momma Silkie hen and her recently hatched baby (which itself was the only egg to survive incubation). This happened in broad daylight, and I'm still not sure what it was, though I was close to getting a look. I was outside working and had been working mere feet from the coop for several hours. Around 7:00, I was on the other side of my property (about two acres), when I heard the chickens making panicked noises which were different than their egg-laying clucks. So I ran back. Upon rounding the corner to the rear of my property, I saw silkie feathers flying, so I sprinted towards the coop. A hole had been pried back in the corner of the hardware cloth just big enough, about three feet up, where it meets a fence. I knew it was too late for the silkie, but I pursued anyway. Upon chasing whatever it was about fifty yards into my woods by following the feathers, I found my silkie, but it was too late for her. I buried her in my garden. I never found her baby. She was such a great momma too. She let me handle her and the chick without issue and even after her brooding was done, she let me pick her up. Whatever the predator was, it was small to have gotten through the hole that was pried open. Maybe a weasel or raccoon? I don't know.
Because of what happened, I've returned to trapping. My woods are the only woods the near area, I'm surrounded by housing additions, so every garbage-gathering mammal lives in my woods (along with beautiful animals as well, such as deer and coyotes). This is temporary, but setting the trap right by the coop makes me think I can target and dispose of only those predators which have gotten too bold and approach the area despite the lights and my presence.
In addition to the trapping, the longterm solution is that I'm building a mega fortress chicken run! I started the project earlier this week and should be wrapping up by the end of the weekend if the weather will let up. I'll attach some pictures!
I'm likely going to move the coop out of the run altogether and just have the entrance of the coop/ramp go into the run. There's a small section under the playhouse that's covered. Otherwise, I'm wrapping the entire thing in hardware cloth.
My final update is that my other silkie has gone broody, but she's not quite the natural that my deceased silkie was. First, she pecks at me when I get eggs out from under her. It doesn't hurt, but it's annoying. On top of that, when I move her, she runs out of the coop like I've tried to kill her. My other momma would just wait patiently right next to me and then sit back down. I picked up 12 chicks from tractor supply last week and I decided to place a couple of the chicks under her at night, as I've read they can be accepted by the broody hen. I thought it worked, indeed she sat on them all night, but the next morning, she got up and walked outside for a good long while. Then when she returned, she couldn't quite figure out what to do with them. She clucked loudly and sort of nervous paced around them while staring at them. Then she finally sat in a different nesting box. Thanks a lot, momma silkie. So I returned the chicks to the incubator. Of course, if my roo hadn't died, I'd happily let her nest on some eggs. Oh well, I'll deal with her somehow.
Your new fortress upgrades should help.
As far as the other silkie, you may still be able to get her to adopt. New moms can get confused and darkness helps a lot. Basically if you keep it darkened and keep the chicks under her, she'll be fine. As a day or two pass, she'll 'talk' and start to bond with them. I use a plastic storage tub inside so I can keep an ear out for trouble. Confused hens may peck at chicks as intruders. I place a lid with soaked chick feed near the hen so the chicks can peek out and grab a snack. Once you see the hen tidbit and the chicks respond by running out to eat, you're good. Some hens have a better learning curve, but it's far easier if you can get her to adopt the chicks.
My golden silkie (from post above) is not very bright. It took her a while for her to get the hang of it, but she did well in the end. My other silkie loves being a mama but she can get distracted if she sees some shiny object or thinks treats are coming. I've seen her run off to chase after something and then realize she forgot her chicks and run back. Thankfully the rest of my flock is accustomed to having chicks around, so another hen may hang out & watch near them until the distracted silkie returns.