Dought & clear, - Whoever breaks the fast when making up a missed Ramadaan fast only has to make up oneday

A woman was making up one of the days that she did not fast in
Ramadaan because of menstruation, then her period came on that daywhen
she was making up the fast. Does she have to make up one day or two?.
Praise be to Allaah.
She only has to make up the day that she did not fast in Ramadaan,
because the day she wasfasting when her period came was only to
replace the day that she did not fast in Ramadaan; it was not a new
obligatory fast.
Ibn Hazm said inal-Muhalla(6/271): Whoever deliberately breaks a fast
observed tomake up for a missed Ramadaan fast only has to make up one
day, because the obligation to make up the fast applies only to the
Ramadaan fast. It was narrated in a saheeh report that the
Prophet(peace and blessings of Allaah be upon him) made up that day he
missed of Ramadaan. So it is not permissible to add more to it without
any shar'i text to supportthat and without any scholarly consensus. It
was narrated from one of the salaf that he has to make up two days,
the day from Ramadaan and the day when he was making up that fast.
It says inal-Taaj wa'l-Ikleel: Whoever breaks a fast observed tomake
up for a missed day from Ramadaan onlyhas to make up one day. And
Allaah knows best.