Is it permissible for a woman who experiences intermittent discharge to combine the ablution for the Night Prayer with the ablution for the Dawn Prayer?

A woman afflicted with vaginal discharge must perform ablution for each prayer after its time has begun, according to the majority of scholars. Ablution performed before the prayer time is not sufficient if any discharge occurs or if another nullifier of ablution takes place.

If she performs ablution before the time for the Tahajjud prayer begins and is certain that discharge has occurred, she must repeat ablution for the Fajr prayer after its time has begun. The fear of hardship does not permit her not to repeat it.

However, the Maliki school of thought holds that it is not obligatory for someone whose ritual impurity is constant to perform ablution for every prayer.