Hex Hall series
A few years after Sophie learned she was a witch, she finds herself in a scrape after a spell goes wrong at prom and her dad ships her off to an isolated reform school for paranormal teens. Someone has been attacking students at Hex Hall and her only friend is the top suspect. Toss in an ancient secret society and things are about to get really interesting.
Publisher’s description:
Three years ago, Sophie Mercer discovered that she was a witch. It’s gotten her into a few scrapes. Her non-gifted mother has been as supportive as possible, consulting Sophie’s estranged father???an elusive European warlock???only when necessary. But when Sophie attracts too much human attention for a prom-night spell gone horribly wrong, it’s her dad who decides her punishment: exile to Hex Hall, an isolated reform school for wayward Prodigium, a.k.a. witches, faeries, and shapeshifters.