Why not let them raise their own queen if you are having problems, it saves money buying queens and they still have time to build up after she is mated for the winter??? something tells me if you killed the other queen and after this time you still have cells being built they have another queen just starting to lay,,,, a supercedure will have the old queen and a new queen at the same time,, you could have missed a queen cell before all this,,, just my 2 cents..