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You could try putting a clutch of regular eggs in the dog crate with food and water nearby and put her in there. If she sits you can put hatching eggs under her carefully.

She might, I'm not going to promise anything though. Did you try moving her to a new nest at night? That works a lot with chickens. She won't see what's happening and all she'll know if that she's sitting on eggs and she might brood on them.