Mr. Jenkins Chap 7 SG
Pg. 123 "Why are being so belligerent and uncooperative?" Charles echoes the words that Meg's high-school principal Mr. Jenkins, who asked her if she "enjoyed being the most belligerent, uncooperative girl at school." Charles, like Mr. Jenkins, has become a figure of uncompromising and unfeeling authority. His resemblance to Mr. Jenkins emphasizes the extent to which Meg's journey from Earth by means of a wrinkle in time is also a journey into the psychological content of her own consciousness. Through the transformed Charles Wallace, Meg revisits her memories of a crucial experience on earth.
I found the meaning of this passage on SparkNotes.com. not only are the summaries outstanding, but the comments really give you a great perspective!