Bloomnbeauty... Have you thought about trying some type of brace, along the same lines as the bandaids, for your pullet now even at 4 months? Something just to bring her legs together, where she might learn to push up and stand in time. I don't know if it's possible or not, but might be worth a try. I'd wondered if I would have to try something like that on my polish if she had never improved. At least with the bandaids on, she had both feet under her and could stay upright and waddle to the food and water. If she hadn't have gotten better and started standing again, I was going to try to make a larger brace with some stiff fabric and velcro, just so she could still be part of the flock and get around. Anyway, I'm not a vet, and don't know if it would ever completely cure her or not, but it might just help her get around.
