ANSWER:

This fast is not valid as when Fajr was due, she wasn’t pure. 

If a woman is in the state of impurity (periods or janabat) gets a bath to purify herself after fajr prayer let’s say by 11 a.m. but she has not eaten anything after fajar. So can she intends to observe fasting for that day when she gets purified after fajr salah?

Fasting | December 21, 2017 3:50 pm
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when is the latest you can make intention to fast a voluntary fast? E.g after fajr Adhan but before the white thread of dawn?
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i was not a v.practicing muslim until a few yrs ago.i wasnt regular with my salah.cant make them up the no is big.i wanted to know what shld i do of the mised ramadaan fasts?shld i make up for them becoz i used to fast ramadaan frm when i rchd puberty.however there was only 1 yr when i did not fast ramadaan becoz of my exam prep.also wht abt the missed fast due to mensesthat i still owe for yrs