Wow an interesting situation. Can the aspirin be offered with the vitamins? If so, might assist with the inflammation. Poor hen is so uncomfortable. Her avoidance of food may be keeping weight off the painful foot, but inevitably she needs to eat. It's sounding more urgent that the foot pain be solved...I admire your determination. Good luck with your baby.
I'm, also wondering if you need to search 'bumblefoot' here at BYC, if she was in moult and did suffer some nutritional deficiency her immune system coujld be down enough to cause it...