Italians are usually lighter in colour. I'm not an expert on colours, though. Even in the six years that I've been raising quail the colour names have changed and a lot of new colours have been introduced.
Individual pics would help, but I see two dotted whites, two pharaohs, and two that look like tibetan. I'm not sure what the one in the middle is, but I suspect sparkly.
Bobwhite and gambels have pretty much the same dietary needs as coturnix and buttons. Here is an article that will help you find what you're looking for. I hesitate to recommend specific brands since you can often find good local brands that have all the nutrition that they need...
That's one of the reasons I'm not fond of AI. In addition to the inaccuracies and making people even less capable of thinking for themselves, the power and resource usage of the immense data centers needed to run it are incredibly resource and power intensive.
Some quail will stay active throughout winter. I have a hen who continues to lay all winter and the occasional crow can be heard. There are always exceptions to the rules.
I don't have a lot of experience with bumblefoot, but I don't see anything that looks like a kernel on those feet. I would keep giving her the warm epsom salt baths and keep her on clean bedding until she heals. You can use antibacterial ointment, but make sure it doesn't contain pain killers.
Your best option would be to send the quail to your state necropsy lab. They will also be able to test for certain diseases.
If you don't want to do that, you can open the bird up and look for physical issues. If you suspect blockage, open up the crop, intestines, etc. to look for one.
That...