Bleeding of menstruation which takes place once in every month for at least three days and up to ten days, is called in jurisprudence as Haydh حيض during which no Salaah is allowed for the female. Any other bleeding which is not Haydh does not allow the female to stop praying. Estihadha is a bleeding which has nothing to do with menstruation and female must perform her Salah  (Namaz) after performing a Wudhu for every Salah if the bleeding is in small quality which means the pad is not filled by blood. If the blood fills the whole pad but it does not leak out of it, one Ghusl must be added  before Fajr Prayers. If the bleeding is heavy that the  blood fills the whole pad and leaks out of it then three Ghusl must be performed; one before Fajr Salah, second before Noon for Dhuhr and Assr prayer and third before Maghrib, for Maghrib and Isha prayer.

Wassalam.