PMS is a sign of nutrient deficiencies; mainly calcium, magnesium, omega 3's and the B vitamins.
Look at her diet and add as many raw fruits and veggies you can. Cook a few vegetarian meals, even if you add a meat, because they will contain more veggies and complex grains. Limit soda's (even diet) so they are something 'special'. Try water with fresh lime juice.
For immediate 'relief/results' when she is upset, crying, moody or has cravings, give her a 3-4 B-Complex caplets. B-Complex is water soluble and the extra will be flushed out in her urine which will be bright yellow. When my second daughter was a teen, I'd walk up to her with water and the B's. She'd just take them without question. She'd feel better within 30 minutes. I believe ALL women need B's because we manage stress differently than men.
Recommended Daily Amounts for a Teen:
Multi-vitamin with Iron, one serving per label
Calcium, 1200 mg*
Magnesium, up to 700 mg
Omega 3's, 1000-3000 mg
B-Complex, minimum 2 per day and more based on diet. Take with meals containing sugar and white processed starches or when stress is present. FYI, B's are best taken with all B's present in a balanced amount unless you are treating something specific such as depression or addiction.
* I suggest she take 1/2 her dosage of calcium at night before bed, the rest of the calcium and other nutrients with food.
Try a brand you trust and if you don't see a difference immediately with the B's or for PMS, within 1-2 cycles, switch brands and review the diet!! Recommended Brand (there is a difference), Shaklee.
I have 3 daughters (23, 21, 15) and none of us have PMS when the diet is decent and supplementation is regular. (It's not genetic because we are a combine family). Our cycles last 3-4 days, 1st day is normal flow and days 2 and 3 are lighter and lighter. We are also regular with cycles every 28-29 days.
-I love your sense of humor so she is in good hands in that environment :)!!! Teens CAN bring joy because they are in the mode of discovering themselves and the new interactions of friendships with a wide variety of personalities. There is much pressure at school. The bottom line for me with one of my daughter's that was "tough" was to say "I love you" daily, regardless of her actions and comments. You may not like your daughter's actions or comments at times, but if she knows you love her unconditionally, she'll come around... But good nutrition is a MAJOR help. :)
Blessings and Joy Daily, M.
Note: I am not a doctor and these statements have not been evaluated by the FDA. The products and comments are not intended to diagnose, treat, cure or prevent any disease. These words are my opinion based on experience by switching brands several years ago after being on various brands for the previous 23 years.