Is the blood that came down after the cessation of the menstrual period for two days, then reappeared after another two days, menstrual blood or istihada blood, knowing that it carries the characteristics of menstrual blood?

The maximum duration of menstruation is fifteen days, and anything beyond that is considered istihada (non-menstrual vaginal bleeding). If bleeding occurs for ten or thirteen days, this entire period is considered menstruation. As for the days interspersed with no bleeding, some scholars consider them part of menstruation (the sahb approach), while others view them as days of purity (the talfiq approach), which is the adopted opinion. Therefore, she should perform ghusl (definition) (ritual bath) and pray, and if the bleeding returns, she should stop praying, as long as the total days of bleeding do not exceed fifteen. If the days of bleeding exceed fifteen, the additional days are considered istihada.