She did not make up the fasts she missed due to post-natal bleeding because her husband told her she was not required to fast
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Fatwa number ( 15707 )
Q: Twenty-seven years ago, my mother gave birth during Ramadan and was unable to fast. She then wanted to make up the fasts she had missed, but my father told her that making them up was not obligatory. However, we learned that it is obligatory for her to make them up, but we would like the answer to come from you. What is obligatory for my mother, and what is obligatory for my father?
A: It is obligatory for your mother to make up the fasts she left off due to childbirth, and in addition to making them up, she must feed one poor person for every day as expiation for delaying the making up of the fasts. Your father must seek forgiveness from Allah for what occurred from him in the form of speaking without knowledge, and he must not return to such a thing. And Allah knows best. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Q: Twenty-seven years ago, my mother gave birth during Ramadan and was unable to fast. She then wanted to make up the fasts she had missed, but my father told her that making them up was not obligatory. However, we learned that it is obligatory for her to make them up, but we would like the answer to come from you. What is obligatory for my mother, and what is obligatory for my father?
A: It is obligatory for your mother to make up the fasts she left off due to childbirth, and in addition to making them up, she must feed one poor person for every day as expiation for delaying the making up of the fasts. Your father must seek forgiveness from Allah for what occurred from him in the form of speaking without knowledge, and he must not return to such a thing. And Allah knows best. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.