Yesterday I released my new queen after introducing it into a nuc last June 21st with only nurse bees and closed brood in it. This afternoon I thought of taking a peek at the screened bottom and to my surprise I found the Queen dead on the floor. I removed the Queen and inspected her and saw no signs of the bee being attacked. Wings, legs and everything else seems ok. Was it possible that she got balled? Or what other possible reasons could there be that caused her death?