Slipped tendon in adult bird???

[poultry for me]

I think one of my d'Uccle hens has slipped tendon. I don't know for sure.

Here are her symptoms, any advice/help is GREATLY APPRECIATED.
Limping, scab on breast bone, curled toes, difficulty walking.
She does not have any legs twisted inward or outward, and she looks perfectly healthy. She is now separated so I can keep a close eye on her.