Update:
We order those antibiotics and they'd have gotten here by Monday (today) but I had a gut feeling she wasn't going to make it till then, so we took some money from saving and got her to a vet on Saturday.
They told us they don't know what could have caused the blackening on the ankle...
We've been use Neosporin on any of the blackening spots.
We're will to buy some but we aren't sure what kind we should get for her.
She's definitely eating and drinking but seems like she's trying not to walk around much.
Thank you, we feel so bad about it. We have been doing daily soaking and wrapping after we noticed. We're just starting to get worried about that ankle because the blackness is spreading and now she's becoming lethargic.
We've owned chickens for about 4 years and had once dealt with bumble foot, all had healed with no complications.
We realized about 2 weeks ago our hens had bumble again and did what we did last time; Epson salt bath, remove bumble, and wrap foot. Most of our hens are perfectly fine now but...