Aisha was asked why a menstruating woman makes up missed fasts but not missed prayers. She referred to Prophetic-era practice: كُنَّا نُؤْمَرُ بِقَضَاءِ الصَّوْمِ وَلَا نُؤْمَرُ بِقَضَاءِ الصَّلَاةِ
Meaning: We were instructed to make up the fasts, but not instructed to make up the prayers.
The report directly distinguishes the two obligations.