The Fire Dancer by Kristen Strassel

At Le Cirque Macabre, Holly Octane bursts into flames five nights a week.
Brought to Las Vegas as vampire bait, Holly’s connection to the immortals is a mystery. She’s one of a kind– traveling through time and igniting when her emotions get too hot to handle. The only people who understand her are an aunt with a hidden agenda and her fortune teller girlfriend.
Cash needs Holly, but she’s not the reason he came to Vegas. The magician seeks Blade, a vampire that has a power he shouldn’t –fire. A power that could determine the future of all of vampire kind. Holly’s the only one who can help Blade control his fire, but their feelings for each other are too fiery to ignore.
Immortals rule the Vegas night, and if Holly lets them draw her into this world designed to destroy her, she’ll lose everything.