Books in Seagull library series series

This book was first published in 1965 by Collins. It is part of the Collins Seagull Library: a hardcover collection of classic books separated into a list for girls and a list for boys. From the Inside front cover: " Joy struggles with nervousness in Laura that first morning at the Marina School of Ballet. Her career -- the only career for her -- is about to begin. Will she succeed, but more important, just at that moment, can she overcome her shyness and find friends here? Laura need not have worried; within a week she has settled down in the friendly, hard-working atmosphere of the school. You do not have to be a ballet lover to find enjoyment here. Incidents abound and, for the mystery addict, there is the puzzling affair of the Pavlova statue to solve. The story of Laura's first term makes fascinating reading. It may even fire your ambition to follow in her steps."