More than half of the women that are migraine sufferers, suffer from distinct form of migraine, known as menstrual migraine.
Acctually, there are two subtypes of menstrual migraine.
One, known as menstrual related migraine, appearing around the time of a woman’s period and at other times of the month as well, and, the second one is pure menstrual migraine, that only happens around the time of a woman’s period.
These types of migraine headaches last longer, are more severe and more difficult to be treated (occur more frequently)
Hormone test doesn't need to show abnormal results to help diagnosing menstrual migraine. The drop in estrogen levels that NORMALLY occurs right before the period starts, is believed to be the reason for menstrual migraine.

Does the headache usually occur two days before to two days after menstruation?

The headache is every day but is worse right before her cycle.

Migraine sufferers usually have headache after the migraine headache attack has finished.
Also, overuse of many medications used to treat menstrual migraine can result in rebound headaches (taking pain medication more than two or three days a week, may actually be contributing to ones headaches rather than easing them, cycle known as rebound headaches), that can have features of tension and/or migraine headaches.
Hormonal changes are known to cause mixed tension migraine, too (may last from 4-72 hours, in some people, the headaches may occur every day), having features of both tension and migraine headaches.
I can suggest for your daughter having acupuncture treatments, being effective in many cases leading to less frequent and less severe migraine attacks.

Best wishes!
Marija