Is it permissible for a woman to skip fasting during her monthly periods?
الجواب وبالله التوفيق
It is impermissible for a woman to fast during menstruation, however, it is necessary to make up for the missed fasts.
یمنع الحیض ۔۔۔ صلاۃ ۔۔۔ و صوما و جماعا و تقضیہ
(الدرمع الرد کتاب الطہارۃ ۔ باب الحیض)
واللہ اعلم بالصواب