If you are walking near a hive on a sunny winter day that has warmed a little (in the mid to upper 30's deg F), you will see numerous bees in the snow. They rest there, but the snow sucks the heat out, and they go comatose.
They "die" and appear really dead. But if it is still within a few hours of them falling to the snow and "dying", you can pick them up, warm them in your hands, and they come back to life.
They aren't really dead, but they do go rather dormant. It doesn't work though if you wait more than a few hours. Then they really are dead.
So you probably could "kill" a bee by putting it in a freezer for a while, bring her out when she appears dead, and the heat of the sun would reinvigourate her. But if you forget her in the freezer, no amount of heat will bring her back.