I ordered some Russian bees and hived them on Monday. Everything seemed good, bees were active and the queen was alive and well in her cage. I pulled the cork on her cage and stuck a marshmallow in the hole and put the cage between a couple frames and closed up the hive. The bees have been really active and working on the sugar water I have in the hive top feeder. So on Friday I open up the hive and the queen is dead in the queen cage. The marshmallow and her attending bees were gone so I know she didn’t get trapped in there. Any idea what happened? Did the bees just kill her?