Thank you, and I'm happy to help you educate me best anyway I can. (By the way, I think I might've worded it weirdly in my initial post, but these chicks are at the very most a week old, probably just a few days. I wanted to make that clear.)
I know for certain it wasn't frostbite as I'd had...
Unfortunately, she passed away this morning. :( However, I'm still going to seek advice in case I (or anyone else in this community, for that matter) experience this kind of problem again.
So, earlier today I bought a few ISA Browns from a local store chain. I've only been raising chickens now for a little less than a year, and I didn't have this problem with my first batch of chicks I bought, so I have no experience with it. On top of this, I have even less experience with...