White Witch Pond by Jody Kihara

Mid-grade ghost story Shaya Solen's walk home from school takes her past an eerie pond, where one day she finds an old bracelet made of raven feathers. Soon, strange events begin to unfold: a shadowy figure glimpsed across the water, omnious nightmares haunting Shaya, and rumours of a witch who once drowned in the pond. With the discovery of a strange family connection to the witch, Shaya is drawn in a mystery that must be solved before the approaching Halloween, which is the thirteenth anniversary of the witch's death, and Shaya's birthday.