Limping Hen

[Dragonfly chickens]

For many months, my hen has a non-weight-bearing limp. No apparent injury, so I assumed it was due to a pulled muscle, etc. But not resolving. Any suggestions?

 

[Dragonfly chickens]

No indication of bumblefoot and she tends to overextend her leg when taking a step as if there is discomfort in the ankle, knee or hip...