Phoenix. The Ember Town Series, #2

When a rogue vampire threatens to expose vampires to humans, Phoenix has one week to prove she's the alpha her pack needs-before her father hands over her birthright to someone else. Phoenix is heir to the werewolf pack, even if her father will not formally acknowledge her inheritance. The alpha has concerns about her leading the pack because she is autistic. Phoenix is ready to show him that she may be different, but she is more than capable of keeping her pack safe. Now, she has a deadline to track down the rogue vampire and make peace with the vampires before the town of Ember goes to war.
She also has to prove that she is capable before her father adopts a new heir. Jared may look the part of an alpha, but he can't fight and he can't think strategically. Giving up the pack to him would be giving up on her family. She has to take down the vampire in a city full of bright lights, loud noises, and more people than she has ever seen. However, Phoenix learned young that an alpha does whatever they need to for their pack.