Is it obligatory to repeat the ghusl if unusual discharge appears after having performed ghusl following menstruation?

A woman is not required to perform ghusl if she sees a brownish or yellowish discharge after her period of purity. She only needs to perform istinja' (cleansing) from them because they are not considered menstruation, based on the saying of Umm Atiyyah (may Allah be pleased with her): "We did not consider the brownish and yellowish discharge after purity as anything." This applies if it is merely a brownish or yellowish discharge; blood has a different ruling.