Atop her shadowy headless horse, Aednat spoke to her new subordinates, her head hanging from her saddle. "Let's get this ugly business over as quickly as possible. All four of us will spread out in different directions. We need ninety-six more Dullahan. Let not sex nor age dictate who you conscript, there is no right way, the offer has been made for any and all to say who would wish to not become part of our thankless army and none have. Conscript all you lay eyes upon until we number exactly one hundred."
"Yes Mi'lady!" The former mother, father, and little girl echoed. Their shadows disconnected from themselves, and rose from the ground, forming into dark headless horses (though headless pony in the little girl's case).
The three new Dullahan mounted their shadowy beasts like they'd done so all their lives, and given they'd effective been reborn as Dullahan, losing all claim they had to humanity and were children of the fey, this was completely correct.
The little girl snuggled the headless neck of her shadow horse. The three new Dullahan took the reigns that formed and drew their swords (or short sword in the girl's case).
And at Aednat's direction, the four pointed in the cardinal directions, and rod. The little Dullahan's pony easily proving faster than that of her three sisters (that they had been her parents in her former incarnation meant nothing to her).
The former father to the hunting log, the former mother to the hair salon (and gossip center) while the little Dullahan made her way to the playground. Aednat herself headed too a group of campers nearby.
Aednat had spent her long time of inactively keeping up to date with every modern human weapon from attack drones to virus software. Armor piercing or hollow tipped hot lead were not cold iron. She never understood why the fey in human fiction were depicted as always having their heads buried in the sand, obvious to the changing world around them and were always surprised when they saw gatling gun or long distance artillery for the first time. Like fey has ceased to keep tabs on humans at the start of the enlightenment.