She was old enough to have known better than to trust the words of her master. Alas, she was probably a young teenager, like Mary, the mother of Jesus, who also trusted her master.
Hagar is the mother of Ishmael. Abraham took Hagar as a second wife when his wife Sara could not conceive a child. Sara eventually did conceive and gave birth to Isaac. In the end, Hagar and Ishmael...