Is it permissible for a woman who has suffered a brain stroke, is unable to move, and wears a diaper, to combine prayers in order to remain in a state of ritual purity, or should she perform each prayer at its designated time even if she is not ritually pure?

It is permissible to combine two prayers for the sick person who experiences hardship and weakness if he does not combine them, for the breastfeeding mother due to the difficulty of purifying herself from impurities for each prayer, and for the one unable to perform ablution (tahara) or dry ablution (tayammum) for each prayer; because these situations involve hardship, similar to a traveler.