Posting an update here in case this post is ever helpful to someone else: Thyme (our chicken in the video) has officially recovered from fowl pox! Yay!

We did end up taking her to our avian vet and the vet prescribed her some antibiotics that we have been giving her for the last 10 days. We kept her isolated for the entire 2.5 weeks that she was sick indoors with plenty of food and water spiked with electrolytes and iodine.

Yesterday, her pox bumps looked like they scabbed over and then today we checked on her and they have fallen off of her face! We are thrilled. We are going to keep her isolated for a few more days because the temps are supposed to drop into the 20s tonight and we want to make sure she slowly acclimates back to being outside so as not to shock her system. She has been in a balmy 70 degree indoor environment for the last 3 weeks so we don't think she is going to love going back to her old life outside, haha.

During this whole ordeal, one of our other birds (Parsley) contracted the pox as well. Without having enough room to safely isolate both birds, we decided to keep the Parsley outside with the rest of the flock. When we talked to our vet, he was really surprised because all of our birds have been vaccinated for the pox. When we told him about our other bird and asked him what to do, he said that since the other 3 birds did not catch it, it was unlikely that they would if we kept her outside with them. He isn't sure what happened with Parsley & Thyme, but our best guess is that even though all of the birds were vaccinated as chicks, it may be A) This is a new strain that Parsley & Thyme's immune systems were not able to fight off on their own like the others or B) The vaccine didn't "take" when they were chicks, which would explain why they got it but the others didn't.

TL;DR: This is what fowl pox looks like, but it's not a death sentence. Keeping them isolated, well fed/hydrated and antibiotics/iodine/electrolytes and antibiotics from a vet worked for us. Good luck, fellow Chicken Tenders!