Why does Woman Who is Menstruating Must Make up for Her Fast but Not for Her Prayer?

وَعَنْ مُعَاذَةَ الْعَدَوِيَّةِ أَنَّهَا قَالَتْ لِعَائِشَةَ: مَا بَالُ الْحَائِضِ تَقْضِي الصَّوْمَ وَلَا تَقْضِي الصَّلَاةَ؟ قَالَتْ عَائِشَةُ: كَانَ يُصِيبُنَا ذَلِكَ فَنُؤْمَرُ بِقَضَاءِ الصَّوْمِ وَلَا نُؤْمَرُ بِقَضَاءِ الصَّلَاةِ. رَوَاهُ مُسْلِمٌ Mu'adha al-‘Adawiya said that when she asked ‘A'isha why one who has been menstruating must make up for her fast but not for her prayer, she replied, “That happened to us, and we were ordered to make up for the fast, but were not ordered to make up for the prayer.” Muslim transmitted it. Reference : Mishkat al-Masabih 2032 In-book reference : Book 7, Hadith 75