What must a girl do who did not fast Ramadan when she reached puberty 17 years ago, and she is not sure about her fasting for the following year? Should she make up a month or 60 days, and is expiation (kaffarah) required for the days she did not make up?

You must make up for all the days you missed from Ramadan after reaching puberty, whether it was the month you missed because your father prevented you from fasting, or the days you missed due to menstruation. As for the month you doubted you fasted, and your mother told you that you did, the default is that you did not fast it, because "prayer, purification, and similar acts are all obligatory acts of worship that must be performed. If one doubts whether they have performed any of them, the default is that they have not. One is not absolved of responsibility for them except with certainty," and "if one doubts whether they fasted or not, fasting becomes obligatory."

Your mother's news that you fasted does not relieve you of the obligation to fast, because "the apparent meaning is that her report is not accepted, even if she is a reliable narrator, regarding the original performance of ablution or the original fast," just as "one who doubts does not accept the report of a trustworthy person that they prayed."

In addition to making up for the missed fasts, you must pay an expiation for delaying for each day, according to the majority of scholars.