Following up from my original post about a year ago:
The hen in question made a full recovery from a bad case of flystrike, with the following treatment:
-Hen was bathed/soaked in a saline solution made from sea salt and warm water for approx. 45 mins 2-3 times a day to kill maggots and...
It definitely has! I needed to treat my Buff Orpington for the same condition... it's gross but at least I know from this thread that it's curable. I will be picking up a Ivermectin injection tomorrow.