"I found them queenless this early spring. The hive was filled with old bees that had made it through the winter..... They readily took to a new queen, but she wasn't laying and the numbers kept declining.
I installed two packages of bees next to this colony. I thought, "What the heck, I'll tap in a few bees to her from those packages." They didn't kill her, but still no eggs. I took two frames of bees from a robust hive and put in there last Monday. Surprise! They didn't kill her. I saw her, but I don't think she is laying yet. At least I couldn't see eggs. They have been cleaning house and last night I saw pollen being brought in."
bakers, some good suggestions. just some additional thoughts.......is it possible that the queen wasn't laying because there was no beebread or pollen, or limited pollen in the hive? were you able to check pollen stores? did they have adequate honey stores? if not, did you feed when you requeened? or add a pollen sub? are you feeding now? with no pollen coming in until recently, maybe that was part of the problem, some queens won't lay if either is not present or coming into the hive.