Daughter of the forest

the long version

"Lord Colum of Sevenwaters is blessed with six sons: Liam, a natural leader; Diarmid, with his passion for adventure; twins Cormack and Conor, each with a different calling; rebellious Finbat, grown old before his time by his gift of the Sight; and the young, compassionate Padriac. But it is Sorcha, the seventh child and only daughter, too young to have known her mother, who alone is destined to defend her family and protect her land from the Britons and the clan known as Northwoods."--Jacket.