The big clue here is that she appears normal in every respect except for sitting on a nest and not producing, or not appearing to.
She may very well be laying elsewhere, or what I think is happening, she's faking it. Who knows why these girls do some of the things they do.
If she isn't sulking and holding down her tail, but is appearing otherwise normal, I would stop worrying about it. If she suddenly acts like she's in distress, then plop her back in the hot tub! If there's an egg, that should do it in nine times out of ten.
She may very well be laying elsewhere, or what I think is happening, she's faking it. Who knows why these girls do some of the things they do.
If she isn't sulking and holding down her tail, but is appearing otherwise normal, I would stop worrying about it. If she suddenly acts like she's in distress, then plop her back in the hot tub! If there's an egg, that should do it in nine times out of ten.