Why is there no Hadeeth that indicates that this discharge nullifies ablution despite the fact that the female companions, may Allaah be pleased with them, were keen to ask about all matters of their religion?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu 'alyhi wa sallam, is His slave and Messenger.

Shaykh Ibn ‘Uthaymeen said: "This is because not all women have this discharge."

Allaah Knows best.