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It happens, and yes, it can happen that quickly. Coturnix quail are notoriously bad at hatching their own eggs.

Take the other birds out and leave her alone. Don't let her have any more eggs. You can mark the ones she has and maybe take a few away. Have a brooder ready in case she actually hatches them. She may get tired of being broody in a few days, so you may want to have your incubator ready too...