Sally Slick & Miniature Menace (Used Paperback) - Carrie Harris

Sally is frustrated when she's shut out of the county fair tractor race, but that's nothing compared to how she feels when the tractor itself goes missing.
When she and her stalwart friend Jet Black track it to the grounds of the Circus Europa, they get more than they bargained for.
Sally can handle nefarious cultists, mysterious fortune tellers, elephants on the rampage, and high flying aeroplanes, but a chance encounter with a miniaturized menace will change everything she knows about the world.
One small girl can make a big difference.