Love and Other Calamities — Virginia Nelson

As a powerful witch marked by the universe, Bobsy Blatherskite saved the world from an apocalypse at the age of thirteen. By twenty, she saved the world twice. Her life has been filled with adventure, excitement, and she's proud to have been the hero so many times… But she's aging and alone and not sure what to do next. Love? Seems like a mundane goal, but it is what everyone else is doing, so Bobsy joins a website and begins to go on a series of first dates. It might not be a dangerous job, but she's sure she can accomplish her goal like she has so many of her others—if you can beat universal odds, after all, how hard can dating be? Enter Ambrose Foster—the perfect man. Or is he? She couldn't have swiped right on the one witch hunter on the whole dating site, right?