Lost in the Flames (Fairy Tail)

Mae Nightingale happens to be a Fairy Tail mage that also happens to have a life threatening secret about her. Everyone in the guild also had secrets, but not as big as hers. The only people that know are Makarov, the guild master, and her best friend Mirajane. The thing is, her secret may help Fairy Tail or if may bring them to their knees.