The Charm Bracelet (Fairy Realm #1), by Emily Rodda, 2000

Jessie hates to think of Granny leaving Blue Moon, her mountain home, but Jessie's mom says she must, now that she's taken a fall and her mind's not working like it should. Jessie wonders if it's not the fall, nor living alone, that's affected Granny, but the loss of her charm bracelet. A midnight summons from the wall to the secret garden shows Jessie that Granny is the true queen of a fairy realm that's now in terrible danger. A trite, patronizing narrative. Textual clues suggest an 11 or 12-year old Jessie, but illustrations and the utter mindlessness of the character, narration, and plot suggest a girl of six or seven, which is probably the target market. Overwritten, obsessed with and justifying its wise and "kindly" adults at the expense of its child hero. A Babysitter's Club of young girl fantasy. Some may enjoy it, but from me, not recommended.