In The Desert Spear Edit
In The Daylight War Edit
It is revealed in The Daylight War that the current queen is the most powerful of all demons and rules the mind court. She lays eggs from her egg sack that is then imprinted by a mind demon. It is unknown if this will make the eggs hatch into other Mind Demons or into lesser demons. It is also unknown if she lays the eggs for all demon kind or only mind demons.
The current queen is not the first queen as it is hinted by the Alagai Ka (royal consort) that the last queen was either killed or died. Other details hint that the current queen is around three thousand years old, as she was born close to the end of the last demon war.
In The Core Edit
During the time she lays her eggs, she is bloated, but her mental strength is not weaker. At some part in the cycle, she lays six eggs with new queens that Alagai Ka must kill to preserve their place.