Olivia Sharp, Agent for Secrets

The Princess of the Fillmore Street School by Marjorie Weinman Sharmat and Mitchell Sharmat, 1989.

Desiree, who has always been a bit prissy, tells Olivia that she has decided that she wants to be princess of their school. She plans to prove that she is a perfect princess by trying to make all the other kids perfect. She is getting on everyone’s nerves, telling them to stand up straight or that their hair needs to be fixed.

When the others ask Olivia to help, she suggests to Desiree that she concentrate on making improvements to the school itself, but even that causes problems. Eventually, things get to the point where the school’s principal asks for Olivia’s help. Can anything stop the princess of Fillmore Street School before she drives everyone crazy?

Olivia’s solution is partly pointing out to Desiree the effect that she’s having on other people and partly explaining that a school which is already governed by a principal doesn’t also need a princess.  Then, she finds a way to help Desiree to feel like a princess even though she can’t be one.