She was angry because Jimmy was in charge of the cereal factory and he was messing up everything, especially the secret formula for "Action-Packed Cereal".
"Action-Packed Cereal" Cereal Factory
"Surreal Cereal Spook" by Robbie Busch, Jaime Garcia Corral and Conchita Mas Fentes has the same problem as "Worse than a Curse". The spook's unimpressive. More to the point there's no explanation as to how the perpetrator of the crime can perform the spooky things, such as floating. No clues lead Scooby and the Gang in the right direction. The motive behind the crime is a good one, but this story really needed more time to grow.