She should abandon prayer during her menstrual period, then wash and pray ; then she should wash during her menstrual period.
Sunan Abi Dawud Book 1, Hadith 303
← Previous Hadith The woman who has a prolonged flow of blood should wash herself every day when her menstrual period is over and take a woollen cloth greased with fat or oil (to tie over the private parts).

Sunan Abi Dawud Book 1, Hadith 302 Next Hadith → When the blood of menses comes, it is black blood with can be recognized; so when that comes, refrain from prayer, but when a different type comes, perform ablution and pray.

Abu Dawud said: Ibn al-Muthanna said: Ibn 'Adi narrated this tradition from his memory on the authority of 'Urwah from 'Aishah.

Abu Dawud said: This tradition has also been transmitted by al-'Ala b. al-Musayyab and Shu'bah from al-Hakam on the authority of Abu Ja'far. Al-'Ala reported it as a statement of the Prophet (ﷺ), and Shu'bah as a statement of Abu Ja'far, saying: She should perform ablution for every prayer.

Sunan Abi Dawud Book 1, Hadith 304