Sefer Ha’mitzvos Ha’Katzar (The concise book of mitzvos)
By the Chofetz Chaim
This book lists the Torah mitzvos that can be observed today
First Section – the Positive Commandments
39. It is a positive commandment to fulfill vows or oaths that one has verbally taken upon himself
As it states in Devarim (Deuteronomy) 23:24, "Guard and do what has passed your lips, as you have vowed." It also states in Bamidbar (Numbers) 30:3, "All that comes from your mouth, you shall do."
This applies in all places and at all times, for men and for women.