From the look of her feet, there wasn’t any infection. If you ever encounter chicken feet wounds again, you don’t need to keep removing the scabs. If there is infection, soak and remove, otherwise you can just keep the scabs clean and protected with wrapping and they should fall off when they’re ready and show healed skin beneath.
The poo looks like a normal caecal poo that’s a bit watery perhaps from the heat.
If it was a sudden heat spike that can really stress out the birds. I know mine really suffer when it’s not a gradual temperature increase but just a sudden really hot day. You can put ice cubes in their water to cool it down.
I’m so sorry this one passed. It’s always hard. She may also have had some other unknown underlying health concern than lowered her immunity.