I So Don't Do Mysteries is by Barrie Summy. The first book in the I So Don't Series. Sherry's father is getting remarried to one of her teachers. If that isn't bad enough, her dead mother has just returned as a ghost and tells Sherry she needs her help to solve a mystery so she won't flunk out of the Academy of Spirits in the afterlife. Instead of being a normal 7th grader and spending the summer with friends and Josh, she finds herself in San Diego with her ghostly mother and her dead grandfather (who has come back as a bird) trying to solve an animal mystery at the San Diego zoo.
Ratings: 6th grade - 6 out of 10.