What's going on with my chicken's wing?

My girls are about 6 months old now. When I got them as chicks, Maude had a droopy wing- that is, the bottom part did not fold up correctly and just kind of hung there. Now that she is older, the feathers on that area are all different colors, but she is red everywhere else. They also look very ragged. None of the others are pecking at her there, either.
Yesterday, I found a couple of feathers from her on the ground. I thought it was normal, but when I picked one up, it had a little tiny bone on it, and a section of bone that looked like vertebrae (it's not that, but it's just similar looking).
Is this normal? Anyone else have the same problem or have seen it before?
Thanks!