The author most likely included the information about the principal’s and teachers’ reactions in order to

Below is supposed to be the passage:

It would be rather fun for a change, Millicent mused, getting her books out of her locker in the hall, rather exciting to be part of a closely knit group, the exclusive set at Lansing High. Of course, it wasn't a school organization. In fact, the principal, Mr. Cranton, wanted to do away with initiation week altogether, because he thought it was undemocratic and disturbed the routine of school work. But there wasn't really anything he could do about it. Sure, the girls had to come to school for five days without any lipstick on and without curling their hair, and of course everybody noticed them, but what could the teachers do?

The answer is The author most likely included the information about the principal's and teachers' reactions in order to introduce another character vs. society conflict.