Is a woman's fast valid if she bathed and fasted after seeing transparent and white discharge on the eighth day of Ramadan before dawn, then saw whiter discharge on the same night and the following night?

If the discharge that appeared on the eighth day resembles the white discharge ("al-qassah al-bayda'"), then menstruation has ended, and her fasting was valid during the period of purity. The subsequent discharges are not considered menstruation but do invalidate ablution (wudu'). The white discharge ("al-qassah al-bayda'") is a white fluid resembling semen or urine. Purity is achieved by one of two things: the white discharge ("al-qassah al-bayda'") or dryness ("al-jufuf"), which is when a cotton swab comes out dry with no blood on it.