yeah apparently this is a reuse of a half sphere piece used for the earth in one set, the reason they used the dome for her head is because there is an x/axle connection at the top but it's still possible to place a minifigure head on it if you use an axle to technic pin comnection
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also there's an upcoming wonka set and i guarantee they'll use this piece for violet, customs about to go crazy
I just hope they come with an uninflated version