Lady Grace Mysteries #1: Assassin book by Grace Cavendish

WHEN MARGARET CAVENDISH, one of Elizabeth I's Gentlewomen of the Bedchamber, lost her life in a bungled attempt to kill the Queen, her daughter, Lady Grace, became a protegee to the monarch, who takes Grace under her wing. Now Grace, a spunky girl who romps through the gardens with the laundry maids and court tumblers and rolls her eyes at her fellow ladies, chronicles the court intrigues that swirl around her. . . . It's the spring of 1569 and 13-year-old Lady Grace, the youngest lady-in-waiting to the Queen, finds herself at a glittering ball choosing amongst three suitors. But the Queen's generosity turns deadly as threats, dark secrets, and even murder descend on the Tudor court. And it is up to Grace to use her intelligence, stealth, and curious nature to solve the mystery that threatens the very lifeblood of England. "From the Hardcover edition." Published By Delacorte Books for Young Readers on 2004