Must a woman make up for the days she misses fasting due to menstruation during the two months of vowed fasting, or is it sufficient for her to fast the sixty days, even if they include her menstrual period?

You must fast for two months when the conditioned event occurs. Consecutive fasting is not obligatory unless you intended it. As for the days when you broke your fast due to an excuse, you must make them up, unless the vow pertains to two specific months, in which case there is a difference of opinion regarding the obligation of making them up. As for expiation (kaffara), it is not obligatory for you according to many scholars, and the preponderant opinion is that only making up the fast is obligatory, without expiation.