Swallow's Dance by Wendy Orr
Now in paperback, a USBBY Outstanding International Book set in the myth-rich culture of Bronze Age Crete. When a volcano cuts short the coming-of-age training of a young priestess, she must find the strength within herself to ensure the survival of her family.
Leira is about to start her initiation as a priestess when her world is turned upside down. A violent earthquake leaves her home--and her family--in pieces. And the earth goddess hasn't finished with the island yet.
With her family, Leira flees across the sea to Crete, expecting sanctuary. But a volcanic eruption throws the entire world into darkness. After the resulting tsunami, society descends into chaos; the status and privilege of being noble-born are reduced to nothing. With her injured mother and elderly nurse, Leira must find the strength and resourcefulness within herself to find safety.