Sarafina and the Pirates' Journey (book 2)

Sarafina and the Pirates' Journey (book 2) by Jaye Helm

Kidnapped by scallywags, Sarafina is forced to cook for cutthroats.  But when she realizes the key to returning home lies with an ancient relic, she must choose between a life at sea with a ghostly legend or face the hangman's noose as a pirate.  Will she make it out of the 18th-century before it's too late? Her fate lies within the secrets of a Caribbean journey and a mysterious spyglass.

YA appropriate book