[cypher]

I would wait for a while before checking the nest but it does sound as though either the babies weren’t viable or healthy or she just wasn’t able to care for them so sad as it sounds she may have culled them or they may have died. It does sound awful but it is natures way of detering predators if the babies die or are unable to survive.
Listen out for any squeaks for a few days & see if she begins to spend more time in the nest just in case.