عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ: ((تُصَلِّي الْمُسْتَحَاضَةُ وَإِنْ قَطَرَ الدَّمُ عَلَى الْحَصِيرِ))
It is narrated from Sayyida Aisha (may Allah be pleased with her) that the Noble Prophet (peace and blessings be upon him) said: A woman experiencing istihada (non-menstrual bleeding) will perform prayer, even if her blood continues to flow onto the mat.