2 deleted 3 characters in body
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This is not a custom. This ismentioned in the Halachafollowing places. see Darchei Darchei Moshe 263:1, Rama 1, Shulchan Aruch HaRav 1, Chayai Adam Shabbos 5:13, Kitzur Shulchan Aruch 75:14, Aruch HaShulchan 11, Kaf HaChaim 10. If she forgot many times then she adds for each time she forgot Magen Avraham 3, Shulchan Aruch Harav 1, Chayai Adam ibid, Kitzur Shulchan Aruch 75:14, Mishnah Berurah 7, Aruch HaShulchan ibid.

The reason for this, is that it is a (Knas) punishment in order that she should not forget.

This is not a custom. This is the Halacha. see Darchei Moshe 263:1, Rama 1, Shulchan Aruch HaRav 1, Chayai Adam Shabbos 5:13, Kitzur Shulchan Aruch 75:14, Aruch HaShulchan 11, Kaf HaChaim 10. If she forgot many times then she adds for each time she forgot Magen Avraham 3, Shulchan Aruch Harav 1, Chayai Adam ibid, Kitzur Shulchan Aruch 75:14, Mishnah Berurah 7, Aruch HaShulchan ibid.

The reason for this, is that it is a (Knas) punishment in order that she should not forget.

This is mentioned in the following places. Darchei Moshe 263:1, Rama 1, Shulchan Aruch HaRav 1, Chayai Adam Shabbos 5:13, Kitzur Shulchan Aruch 75:14, Aruch HaShulchan 11, Kaf HaChaim 10. If she forgot many times then she adds for each time she forgot Magen Avraham 3, Shulchan Aruch Harav 1, Chayai Adam ibid, Kitzur Shulchan Aruch 75:14, Mishnah Berurah 7, Aruch HaShulchan ibid.

The reason for this, is that it is a (Knas) punishment in order that she should not forget.

1
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This is not a custom. This is the Halacha. see Darchei Moshe 263:1, Rama 1, Shulchan Aruch HaRav 1, Chayai Adam Shabbos 5:13, Kitzur Shulchan Aruch 75:14, Aruch HaShulchan 11, Kaf HaChaim 10. If she forgot many times then she adds for each time she forgot Magen Avraham 3, Shulchan Aruch Harav 1, Chayai Adam ibid, Kitzur Shulchan Aruch 75:14, Mishnah Berurah 7, Aruch HaShulchan ibid.

The reason for this, is that it is a (Knas) punishment in order that she should not forget.