There is a chance that she is no longer your queen. Check your civilization status screen.
Usually, necromancers and were-creatures will abandon their jobs upon their transformation, so "Queen" may simply be a note under "Previous Experience" on Zefon's resume.
If she is still the queen, which has happened once or twice before, then you will have your own personal army factory. Just hope her mandates aren't for something stupid.
Bummer. She left her position in late winter of year 41 to begin her apprenticeship under Ineth Chant Construct, a dwarf necromancer married to the dwarf vampire Cerol Bustgifts, who had himself ended his apprenticeship the same year, the same season in fact, after being King of a different dwarven civilization. (The two have similar tales.)
His wife was a wanderer, moving from fortress to fortress, murdering a few dwarves, and then fleeing after arousing suspicion.
They had 6 children before going different paths, (In the 11 years before Cerol became a vampire) only two of which have survived to present (130) Their eldest son, Reg Bodicefate (Born year 2) is also a Necromancer, apprenticed 9 years after his father (year 50) to a different master. The second surviving son is unremarkable, aside from living upwards of 120 years without some divine intervention.
Zefon herself has no family.
Her diety, "Zimun" is a dwarven god associated with disease, death, and murder. Often depicted as a skeletal male dwarf, he has recieved the worship of 4 necromancers, as well as 3 more recent, aspiring necromancers, 2 of which came from Evanbolts, a dwarven fortress. (However one of these died before they could reach immortality)
Legends mode kicks ass, this is a pretty decent tale.