Dragonfly Song by Wendy Orr*

Aissa is born with two extra floppy thumbs.  She is the first born of the priestess and is destined to lead the island in worship and life.  Can a future priestess be imperfect?  The midwife sent to throw her over the cliff cannot bear the task so she leaves Aissa with a fisherman's wife who just lost a baby.  Four years later, raiders from Crete arrive destroying Aissa's adopted family's home.  Her mother hides her in a bush, telling her not to speak or make a sound until she returns.  Her mother never returns and thus begins Aissa's inability to talk.
After she is discovered, she is taken to the great Hall where she lives a life of physical, mental, and emotional abuse.
Can she redeem herself and prove that she is worthy when she willingly leaves with the Bull King to be a bull dancer on Crete?  Can she and Luki free the island from the yearly tribute to Crete?

This book is well researched and submerges the readers into the Bronze Age.    The style is a mix of prose and free verse.
Points to discuss: The island people are extremely cruel to Aissa and abuse her without consequences.  She begins her menstruation  cycle and the author gives details about it.  The bulls kill some of the characters and the bloody fights are described.
*Highly recommend.