The Daughter From The Future

To save the future she had to go back in time. She knows the risk if she fail and if she succeeds. If she fails then the future she if form will destroy the world again. If she succeeds the future will be saved from the evil at the cost of her own life. Falling in love was is one thing but will she let the world fall to keep it or is there a way to save it and still be with him?