What is the ruling regarding a girl who experiences menstrual bleeding intermittently at spaced intervals, followed by yellow or reddish discharges, and is consequently unable to determine the time of purity or the days of her regular cycle?

If a woman sees purity by one of its two signs (dryness or white discharge), she must hasten to perform ghusl (definition), and this is the more cautious opinion. If bleeding resumes within the possible period after ghusl, she reverts to being in menses, then performs ghusl again when it ceases. As for yellowish or brownish discharge, unless it is connected to blood, it is not considered menses except during the customary period. Consequently, it is not considered menses after the cessation of bleeding unless the woman knows that it usually appears during her customary period.