I noticed you listed Louhi as a possible aspect of the Winter Witch, and it feels like it fits, even if finnic mythologies are remote enough that exact mappings may be hard.
Something worth noting is that at least in Kalevala, one of her major actions is stealing the Sun and the Moon, and then being forced to release them. Not the exact same story, but dealing with the same fundamental Myth, perhaps.
Winter Witch and Louhi
I noticed you listed Louhi as a possible aspect of the Winter Witch, and it feels like it fits, even if finnic mythologies are remote enough that exact mappings may be hard.
Something worth noting is that at least in Kalevala, one of her major actions is stealing the Sun and the Moon, and then being forced to release them. Not the exact same story, but dealing with the same fundamental Myth, perhaps.
https://www.youtube.com/watch?v=t7cJQeWTGhc