Everything was already prepared; all that was missing was the final placement of the Ark Navigator.
And Sidwell was the planned Navigator.
The queen's power was too closely tied to the Moon World; everyone else could leave, but she alone could not. Her fate was destined to be a collective burial with this Moon World.
Thus, she needed an heir, and that led to the birth of Sidwell.
The reason the queen did not personally raise her daughter was also guided by fate.
The inheritance of successive Queens of the Moon was to connect with the Power of the Moon, thereby borrowing the Power of the World to glimpse into the Power of Fate.
Especially this generation's queen, who had an unprecedented understanding of fate, had been titled Destiny's Lunar Trajectory.