Wall of Wishes - The Fountain, #3

Save the fountain or risk being erased. Hidden deep in the woods is a fountain that has granted St. Augustus students' wishes for nearly a century, including the wish responsible for Ava's very existence. When she learns that the woods will soon be destroyed to make way for a new road, Ava must do whatever it takes to save the fountain, or risk her own life being erased. New girl Courtney knows more about the school's magic than she's letting on and has something to gain from the fountain's destruction.
Joining forces with Courtney seems the only way to stop the road, but Ava and Coutney share a thorny past. Trusting her is impossible, but if she doesn't, Ava could disappear forever.