As a non-Israelite, she will not become part of the master’s family, and her slavery is perpetual, not limited. As property, she and a male Israelite slave can be mated by the master to breed more slaves, which cannot be done to an Israelite handmaiden. The foreign bondswoman does not choose her husband and cannot reject him. Both he and her children can be taken from her
Quote from My Jewish Learning article titled the slave wife