...on the island, she mentioned that it might be able to be used to protect someone if you bound their spirit to it with a hair.

[she says, like this is totally normal. maybe it is? it's apparently normal enough to be given as a gift?? even if there was a little mix-up with the type of doll it is.]

Perhaps, if you return it to her once you see her again, you could complete the ritual together so it would work...?