Ramona The Brave by Beverly Cleary

Ramona is happy to have a new bedroom all to herself - during the day, at least. It's not as easy to be brave when there might be ghostly, boneless gorillas oozing under the door at night. Then there is the big, mean dog that steals Ramona's shoe on her way to school. Any other first grader might be frightened. But it's going to take more than monsters and dogs to scare this fearless first grader!