Is the woman who is unable to make up all missed prayers sinful, and will Allah forgive her if she dies before completing the make-up?

Sincere repentance is accepted by Allah Almighty. Missed prayers must be made up according to one's ability, such as making up two days' worth of prayers in a single day, provided that this does not negatively impact one's studies or work, for those who need to balance these. If making up this amount is difficult, then one should make up a lesser amount according to their ability. If a person dies repentant, Allah willing, He will forgive them.