The fact that here pads are swollen could be a sign of TB. I have only seen it in hens, but what you have described is typical. They get what looks like bumblefoot and can only walk if supported by their wings. They gradually get weaker and die after a long illness. Have you tried lifting her? Another classic sign is that they lose weight, which often goes unnoticed under the feathers. Another sign is that the droppings take on a distinctive odour and stick to the vent more than is natural.
I have kept poultry since I was 5 and in my youth have nursed sick birds - sometimes for months. But I've always found that where they go off their feet as you have described, and also where they have lost a lot of weight - they never recover. So depending on how bad she is, I would consider putting her to sleep to prevent further possible infection to the rest.