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At the end, Tear's mother ended being the manifestation of the Crown of Skadi herself. Her protective nature, her relentless love for Tear, and how she was capable of giving it all for her, it was all because the Crown of Skadi desired Tear to continue staying at her side as well.
She created a manifestation of herself and used her powers to brainwash Tear's mind, making her think she was actually her mother. In that brief time, she learned about the love of a mother, and was loved. For being born as a Divine Relic, the Crown was much different than any other Relics.
Imbued not only with Skadi's Divinity, but also a part of her very soul, the Crown of Skadi was like her other half, designed to give one of her descendants the power to govern the Ice Giants… However, Skadi ended storing her away after learning that the Crown developed a mind and ego of her own, and that it could dangerously take over the wearer's minds.