If you removed that part that stick out, you might see what you expect with bumblefoot, if it is indeed bumblefoot. Push that thing out.
From my flock, one of my hens did have this issue, although not as big as the one your hen is having. I did not check them for it until I saw one foot is bigger than the other and it was under.
I used the Band-aid advanced healing, it has a small size and it is very good at promote healing.