Original: Once the circus is set up, Mrs. Jumbo loses her temper at a group of children for making fun of her son, and she is locked up and deemed mad.
Simplified: When Mrs. Jumbo can't take the public making fun of her son, she is locked up as "mad elephant", and Dumbo finds himself all alone. As his mother, Mrs. Jumbo, beats up the bullies who pick on her baby, the ringmaster has his helpers chain her up and lock her up in a trailer, which says: "MAD ELEPHANT".