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If her crop is not emptying overnight, then I would begin treatment. https://www.backyardchickens.com/articles/how-to-treat-sour-crop-and-impacted-crop-and-how-to-know-which-one-youre-dealing-with.73607/

At a year old she should be in her production prime. She stopped laying eggs, or you think she's eating them? Does she have any bloat or swelling in her abdomen below the vent between her legs? In the photo she looks bright and healthy looking to me.

Re-check the crop first thing in the morning before she's had anything to eat or drink to see if it's empty/flat. If the crop is emptying, then I would not treat her with anything. Does she happen to be broody?