What is the ruling if one vows continuous fasting for a month starting at the beginning of the lunar cycle and breaks it due to illness or menses?

Primary text

If one fasts a month starting from the beginning of the lunar crescent, and falls ill for known days or a woman experiences menses and purifies herself before the month ends, she must make up the days missed according to the duration of the month being complete or deficient. This ruling depends on the established opinion concerning breaking the fast on Eid and the days of Tashreeq.