Small Town Big Magic by Hazel Beck

A witchy rom-com in which a bookstore owner who is fighting to revitalize a small midwestern town clashes with her rival, the mayor, and uncovers not only a clandestine group that wields a dark magic to control the idyllic river hamlet, but hidden powers she never knew she possessed.

Witches aren't real. Right?

No one has civic pride quite like Emerson Wilde. As a local indie bookstore owner and youngest-ever Chamber of Commerce president, she’d do anything for her hometown of St. Cyprian, Missouri. After all, Midwest is best! She may be descended from a witch who was hanged in 1692 during the Salem Witch Trials, but there’s no sorcery in doing your best for the town you love.
Or is there?

As she preps Main Street for an annual festival, Emerson notices strange things happening around St. Cyprian. Strange things that culminate in a showdown with her lifelong arch-rival, Mayor Skip Simon. He seems to have sent impossible, paranormal creatures after her. Creatures that Emerson dispatches with ease, though she has no idea how she’s done it. Is Skip Simon…a witch? Is Emerson?

It turns out witches are real, and Emerson is one of them. She failed a coming-of-age test at age eighteen—the only test she’s ever failed!—and now, as an adult, her powers have come roaring back.

But she has little time to explore those powers, or her blossoming relationship with her childhood friend, cranky-yet-gorgeous local farmer Jacob North: an ancient evil has awakened in St. Cyprian, and it’s up to Emerson and her friends—maybe even Emerson herself—to save everything she loves.