In all the other versions Dacy was available right from the start.
However...I don't know if it was a blunder on Ijji's part, but they said getting Dacy will involve a quest (i.e. Lime's 4-8 quest) or you can purchase her from the Cash Shop.
Nobody knows what this quest will entail or how to do it, since if it does require a quest, it will be a GLunia exclusive. So it's pretty useless asking for help when nobody knows what you'll have to do as of yet.