What is the expiation for intentionally aborting a fetus in the third month without the husband's knowledge, while being ignorant of the permissible age for abortion?

A woman who caused a miscarriage must repent sincerely. Two things are incumbent upon her: First, blood money (diyah) for each fetus, which is one-tenth of the blood money for a woman. She must pay it from her own wealth, and she does not inherit from it. It is waived if the guardian pardons her. Second, expiation (kaffarah) for each fetus, which is: freeing a believing slave. If she cannot find one, then fasting for two consecutive months. The expiation is not waived by pardon.