>What possible scenario would result in a queen laying no eggs at all?

Presumably a problem with her ovaries?  I have certainly had queens that did
not lay eggs (not many it's true) and also queens that stopped laying eggs
in later life (not just a temporary pause, but a complete stop).

> an unmated queen will become a drone layer after about 20
days if not mated."  (This from an Ohio workshop I attended, so many moons
ago, the notes were taken on a Palm Pilot).

Not always - I have seen a queen return from a mating flight after 6 weeks -
yes weeks - and go on to a long and fruitful life.

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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