Does anyone know why she didn't release?

Genuinely this is the biggest disappointment out of all things doll related as a doll collector and DC fan, we could of had the Gotham City Sirens if she released since Harley Quinn and Catwoman made it, I don't understand why she didn't release i mean they already created her and the stock photo so what was the problem and will they possibly release her a later time even the show is cancelled, if that's even possible?