Probably better move, at least for a while. You can not know what the powers of the being are. If this is a Strega, this means the being is some sort of Vampire (different from the ones in the movies, but a vampire nonetheless), she wants to feed on you. If the being is a Dark Elf (a marine one), her intentions can be very different. In this case, the blood of her kin is in your veins and she knows it.

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Anyway, not a mere ghost, but a being with a body, even if this body is different from a living, Human body. The attitude Emma had suggests more the Strega possibility, Emma being, perhaps, like some sort of farm animal for the Strega, feeding on her blood or on her life force, or both. Regardless, she seems to want you for herself. Move as fast as you can, at least until things settle.