Diamond's Dark Glow. Fairy Mafia, #10

To stop a future of annihilation, dark fairies plot to extinguish the threat in the present. Unsuspecting of the danger, Jorja is unaware that a time traveler has come from thirty-seven years in the future to change the past to prevent her own death at the hands of Jorja's eldest, Amari, the Summer Queen. In that future, Amari is doling out death but the queen at her back isn't her mother, but the Autumn Queen. When Jorja learns of this possible future, she's stunned.
Why wouldn't she support her daughter in a war against dark fairies? There is only one answer, and Amari's kidnapping puts Jorja in a race against time to save her daughter. Naturally, there is only one warrior she can call to help protect her family, but there is a hit on Russo as well. As the two warriors come together once again, the future insists only one of them will survive.