For hundreds of years before the Wedding That Never Was, The Seeker of the Ladies Three had long been giving omens to her sisters about a Dark Power that would take over the land and remove them of their splendor. The Huntress and The Weaver had never trusted their sister's augury, thinking them to be generic flights of fancy. After the Wedding That Never Was, the warmongering Human Strahd von Zarovich became a Darklord, and turned the Zarovich Valley into his own domain of Barovia.
Once this happened, the Seeker seemingly disappeared; in truth, she withdrew from her fane at Old Bonegrinder and hid among the Vistani as "Madam Eva", allowing her worship to stand without her visible hand. In doing so, rumors grew that her prediction of Strahd's takeover had left her to abandon Barovia before it became closed off to the Deepmists; having given her warnings, she allowed the Desecration Of The Mountain Fane and the Desecration Of The Swamp Fane to occur despite her foresight.
After killing the Weaver, Strahd looked to finish off the Seeker, hoping to rid his domain of any challenge to control the land. However, as he had with the Lady of the Swamp, he could not locate her: instead, he found her fane, unguarded. Though he believed that the rumors of her disappearance a half-century prior were true, he still came to the forest fane with violence and terror, slaughtering hundreds of forest-folk and their Ravens, and let their blood seep through the Fey Crossing embedded in the stones. Strahd took pleasure in bending the engraved Portals to his use, even as his growing dominion over the land made such shortcuts unnecessary.
Though she had never attempted to resist his dominance over the domain, the Seeker was now unable to feel a connection to the land, and Strahd subsumed her control over Barovia's winds. Having already severed both her sister's fanes, Strahd now had total control over shaping the landscape of Barovia. He would maintain this ability until the Slaying Of Strahd.