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Looks like pieces of immature follicles or it may be blood clots too. I'd make sure she has a source of Calcium available.

Did you take some photos? Could have been an intact follicle, hard to know without seeing it.

Could be a Follicle. https://www.backyardchickens.com/threads/expelled-oviduct.1597764/post-27165529 If everyone is acting o.k., then I'd just monitor for now. .