Read the passage and find the corresponding person for the given pronoun. The word between ** ** is the target pronoun.

When his father died in 1376 Edmund quarreled with his half-siblings, the children of his father's second marriage, over inheritance rights. Edmund was imprisoned in the Tower of London until he was released in 1377 by request of his brothers-in-law. After their father was executed for treason in 1326, Isabel and **her** youngest sister Elizabeth were the only daughters of Hugh the Younger to escape being confined in nunneries, Isabel because she was already married and Elizabeth because of her youth.
Isabel