Hi, I think it is not a matter of fear. I’ve found most women are different. It never bothered me one way or another, I never had any complaints that my personality changed. in any way. There are a LOT who do tho, I worked a lot of women who you just knew had their period. IF it’s too out of hand tho, she can go see her Dr. who can put her on meds. that would help her. So why suffer needlessly when she CAN do something about it if she only would.
best of luck.