When should a woman begin to fast and pray if she experienced bleeding for two days, then light brown discharge, tending towards whitish, on the seventh day of Ramadan?

What is seen of discharge after blood and before dryness or the white discharge (al-Qassah al-Bayda'), is considered menstruation. Thus, prayer and fasting are forbidden, based on the saying of 'Aisha, may Allah be pleased with her: "Do not rush until you see the white discharge." And whatever a woman sees after blood, of yellowish or brownish discharge, before the sign of purity, is considered menstruation. The sign of purity is the dryness of the private parts or the sight of the white discharge.