The ruling on a woman in post-natal bleeding becoming pure before forty days and the delay of purity after that

Question:
Is it permissible for a woman to fast before completing the forty days if the blood stops from her, or must she complete the forty days?

Answer:
When she becomes pure, it is obligatory for her to fast and pray, even if she is within the forty days, and she becomes lawful to her husband. The criterion is purity. So if she becomes pure before twenty or thirty days, she takes a full ritual bath, prays, fasts, and becomes lawful to her husband, even if she has not completed the forty days.
If it continues with her until forty days, she takes a full ritual bath on the fortieth day, even if the blood is still with her, because the limit is forty days. So she takes a full ritual bath, prays, fasts, and becomes lawful to her husband after the forty days, even if the blood is still with her. However, she performs the ablution for every prayer time and protects herself with cotton or the like until it ceases from her, except if it coincides with the time of menstruation. She sits out the time of menstruation after the forty days. Yes.