My guess is that Zane kidnapped her becuz he can see ghosts and her mother wanted her to stay away from the palace cuz it’s a living hell there and maybe the father killed the mother and she doesn’t want her to get abused so he sends Zane to save her and they reunite again but the mother is a ghost OvO my guess is kinda bad tho but I dunno TvT
I think Zane's hint is that the person who killed her mother is trying to kill her. Zane knows that so he kidnapped her first so she won't die. And if that person is Zane's boss then Zane will disobey him.