A queen in a functioning nest
would suppress this development in all other individuals, halting their
development at the penultimate imago stage. This could be accomplished
via a special queen-produced chemical signal which causes the destruction
of adult canopies. A lone imago metamorphosing into a queen-imago
might require a period of hibernation as it develops the morphological
characteristics of a queen: the auxiliary ventral arms, large headpiece
sheath and externalized ovarian systems with associated legs. In this case, the adult canopy might be the source of the developmental signals which trigger the transformation, and would develop into the sheath. The queen-imago is a form devoted to producing large numbers of eggs in a short amount of time. Presumably, this form is a novel development which is specific to the social species. It might be that imago form retains the ability to create eggs at a much lower rate and at much greater expense to itself. This would require an override of the natural inclination for canopied imago forms to develop into queen-imagoes, and would probably only occur under periods of extreme stress when the nutritional requirements of metamorphosis into a queen could not be met.
The reason, why I brought up the nest and eggs. is because, the egg's was in the movie, and a small nest in the hospital that was being built. I may be wrong, as usual. But, I do hope that, it does draw more questions to the fact, that the eggs and the 'queen' was just...not the right way.