Cholmondeley Major was a student at Experiment House in the autumn of 1942. She was also a member of 'The Gang' that tormented other students, including Jill Pole.
She most likely spent most of her time at school bullying other students like Jill Pole, and talking to The Head of the school (but not getting punished), until the time when Eustace Scrubb, Jill, Aslan and Caspian X came to the school and frightened The Head and all the other bullies.
After The Head was sacked from her job, Cholmondeley was likely expelled.
- Her name is pronounced "Chumley".