Hex Hall by Rachel Hawkins

Hex Hall
(March 2nd 2010)
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.
By the end of her first day among fellow freak-teens, Sophie has quite a scorecard: three powerful enemies who look like supermodels, a futile crush on a gorgeous warlock, a creepy tagalong ghost, and a new roommate who happens to be the most hated person and only vampire on campus. Worse, Sophie soon learns that a mysterious predator has been attacking students, and her only friend is the number-one suspect.

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Demonglass
(March 1st 2011)
Sophie Mercer thought she was a witch.

That was the whole reason she was sent to Hex Hall, a reform school for delinquent Prodigium (aka witches, shapeshifters, and fairies). But that was before she discovered the family secret, and that her hot crush, Archer Cross, is an agent for The Eye, a group bent on wiping Prodigium off the face of the earth.

Turns out, Sophie’s a demon, one of only two in the world—the other being her father. What’s worse, she has powers that threaten the lives of everyone she loves. Which is precisely why Sophie decides she must go to London for the Removal, a dangerous procedure that will destroy her powers.

But once Sophie arrives she makes a shocking discovery. Her new friends? They’re demons too. Meaning someone is raising them in secret with creepy plans to use their powers, and probably not for good. Meanwhile, The Eye is set on hunting Sophie down, and they’re using Acher to do it. But it’s not like she has feelings for him anymore. Does she?