This is a tiny shop pushed off to the edge of town. A wooden painted sign of a red crystal in the shape of a crescent moon with no lettering is your only sign.
Smell of incense and herbs of some kind (magic ritual components)
Tons of jewelry in the shop, all for very cheap prices (its all FAKE)
Store is just a front for her Soul Crystal works under the counter
Soul Anchor: A crystal that allows ones soul to be TAGGED upon their death. Once dead, this crystal just needs to be within 20ft of the conception of a child and that soul will be sent into the new life and become this new babies soul.
Soul Beacon: A crystal that draws in the souls of the dead to a location. Can be done generally or specifically. This is what is used to draw in souls to Vallaki to have next to NO soul-less townsfolk, since there are always souls around to inhabit the births. To draw in a SPECIFIC soul needs an important item from that persons past to channel.
Soul Awakener: A crystal that restores the memories of a souls past lives (if any). The longer it maintains contact with the soul the more memories it regains.
A group of the original werewolves left the lands of Barovia and went looking for a demon to counter Strahd, they found one and brought him back trapped inside a crystal necklace. They delivered it in the standard Moonstone delivery to Vallaki and waited for the demon to grow in power and become a problem for strahd and hope that this being would overtake Strahd and then show them mercy.