
Missed Period, Dark Blood Discharge, Stomach Ache, Uncomfortable, Angry, Mood Change

Thanks for posting your query
Menstrual bleeding can vary by a day or so and change in colour as red, brown, black etc every month. Dark blood signifies old menstrual blood and is normal sometimes. You have not mentioned which pills did she have for her periods as various pills(birth control pills/Emergency contraceptive pills etc)can change the menstrual amount and flow.
If her periods are "regularly irregular" then it can be indicative of any hormonal imbalance due to any underlying ovarian or uterine abnormality.
During and before the periods it is common for a woman to have mood swings, depression, stomach ache, anger due to hormonal fluctuations and these are known as Premenstrual symptoms.
For pain relief(stomach) ask her to apply hot water bag fomentation. It will help in relieving the pain. Some over the counter pain killers(ibuprofen,tylenol) can also help in it.
Hope I have answered your query.I will be available for follow up if any.

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