Guinevere Jones S02E02 - Time Cuts

When a faerie dog known as Black Angus crosses Tasha's path, legend dictates that she has only a day to live. Gwen, still on non-speaking terms with Tasha, must exercise her greatest magical feat to date: turn back time to save Tasha. Time travel turns out to be more complicated than she expects, and she must find a way to thwart the forces of destiny if she plans on saving Tasha. In the end, Gwen succeeds, but - because time has replayed - Tasha doesn't realize Gwen has saved her life, and still refuses Gwen's friendship.