Mitzi is another friend of Bradley's who’s a smart, inventive mouse. As the brains of the group, she’s 

always busy inventing new gizmos, widgets, and other contraptions, using materials she finds 

around the barn to create new things. Of course, they don’t typically go according to her expectations but they can provide great hilarity to the story. And that’s okay. To Mitzi, inventing is her way of solving a problem and if one invention doesn’t work, she never gives up and tries again!