*Among the factors that break Wudhu, is anything that leaves the body through the excretory organs. This includes, stool, urine, or any other matter. The discharge that is normal for women to have after the menstrual period is over falls in the same bracket and is rendered as a factor that will break the Wudhu.
*This discharge is also considered impure. If the amount of discharge is equivalent to, or more than the size of the dipping centre of the palm (around the size of a medium sized coin), it will have to be washed off, and Salaah will not be valid if performed while it is still on the body or clothes. (Khawaateen Ke Masaa'il Aur unka Hal)
*However, if the discharge is so incessant that an entire Salaah time passes without having enough time to perform the Fardh uninterrupted, you will be regarded a Ma'thoor (excused). The ruling for such a person is that she will perform Wudhu for every Salaah. This Wudhu will last until the time for that Salaah ends, as long as no other factor that breaks Wudhu is found (i.e. the passing of wind).
*If the discharge is not continuous she will not be classified as a Ma'thoor, thus she cannot take advantage of the concessions given to a Ma'thoor.
*The ruling for a woman who does not fit the description of a Ma'thoor but discharges frequently (to such an extent that it goes unnoticed at times), is:- (1) Her Salaah will be valid as long as she is not certain that discharge came out in Salaah. (Mere doubt of discharge flowing during Salaah will not render her Salaah invalid.) (2) Such a woman should insert a tampon, pad etc. This will help to absorb the discharge. Until the discharge does not show on the area of the pad which is beyond the inner part of the vagina, Wudhu will not break. (Ahsan-ul-Fatawaa, Page 80, Part 1)