Tamed By the Highlander by Heather Walker

Stuck in Silver Oak Psychiatric Facility, Caitlin Anderson wishes she could escape, just like her friend Marissa Lower did. When a riot breaks out in the recreation room, Caitlin takes her freedom.
Running for her life, she falls into a river near enchanted caves. The magic surrounding the area whisks her back in time to the ancient Scottish Highlands.

Evan McCrae, knows his laird, Arnou Muir, is a false leader. But challenging his lairdship is not made easy by an encroaching danger. Wolves are stalking the Caves where the Outcasts, Evan’s clan of exiles and misfits, make their home. Worse, there appears to be another clan now living in the Caves. Rumors of witches abound, threatening the Outcasts further.
While on a hunt, Evan finds a mysterious yet beautiful girl unconscious in a river. Taking her back to the Caves, she awakens, talking in a strange tongue of future worlds. With the presence of the wolves and the witches, Evan can only fear the worst.

But maybe the lass is a force of good.
Has she been sent back to help the Outcasts overcome the wolves and witches and for Evan to claim lairdship of the clan?
Or will whatever dark secrets Laird Arnou harbors concerning the wolves take its vengeance out on them all?