All That's Fair (No Less Days #3) by Amanda G. Stevens
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Unable for the last century to grow old or succumb to injury, grieving recently lost friends, Cady Schuster meets Paige, a mortal woman who needs a friend—and might need help. Paige's husband rules their church with an authority unquestioned by his congregation. When she suddenly severs all communication, Cady determines to find her, but how far should an ageless woman involve herself in the conflicts of mortals?