Does my chicken have sour crop?

[Mba]

My chicken has had her crop visible for a few weeks now, but she seems fine and behaves normally. She also eats regularly, so I'm not sure if it is sour crop or not. Just to be safe, I will lock her in her coop without food or water for 12 hours because that's one way to treat it. I just want to confirm if she has sour crop or not, and if their are more ways to get rid of it.