Is is maybe controversial, but I don't think the doll/witch dynamic is any different to the Mech pilot/handler or princess/maid dynamic so many of the girls on here love, and I also don't think dolls need a d/s dynamic. And in fact I kind of feel that insisting on one misses the point of dolls.
Yes, dolls are objects. They have owners. But they don't do anything. They can't perform tasks or acts of service. Dolls are there to look pretty and be admired and be played with. And for me at least, it's freeing to picture myself as that doll or figurine, sat on a shelf, while the ones I love send me affectionate glances while they go about their day. There aren't expectations, there aren't any requirements. I just have to sit there and look pretty. That's what I like about being a doll. If I wanted someone to control me, to demand tasks of me, I'd be a pilot or a hound or a maid.