My Nerd Wolf

She breathed in and out, trying to savour some air, she uttered, "I wish I_" She paused and tried not to open her eyes to meet best friend, Fennick, gaze because she knew she might have a change of heart. "I wish not to have a mate! I wish I had no mate! I wish I won't find my mate and I wish he doesn't find me either!" 
Aurora, swore never to have a mate when her grandmother told her she will die just the same way her mother died because of her mate. Every year on her birthday, Aurora visits the spring to say her wish (I wish not to have a mate!) 
When she turned twenty-one, she went to the spring as usual and this time, Sage, was passing by and he happened to be the mate she never wished for. He fell for her beauty knowing she was his mate but when he heard her wish, he left in bitterness.
Why would Aurora die when she meets her mate? What happens when she finds out the person she took as a friend was her mate? 
Note: This story contains a lot of fantasy and has a different cliche from a normal werewolf book. Please kindly read and support my first werewolf book.