Gynaecologist, Gynaecologist - Infertility (IVF) Specialist, Obstetrician
Simple answer is yes, but the difficulty in answering this question is whether she will be able to naturally conceive a pregnancy or if she will require medical input- Only time will tell. Certainly at the young age of 20, your cousin has time. She can help regulate her cycles by modifying her lifestyle: weight loss if she is overweight or obese, good diet with reduction of caffeine and alcohol intake, and regular exercising.
In the meantime, medical input is required to diagnose the cause of these abnormal cycles. Initially a General Practitioner should be consulted and blood tests to check your hormone levels and thyroid function as well as a pelvic ultrasound should be ordered. A referral to a gynaecologist would be warranted to investigate the condition and achieve a diagnosis. Polycystic Ovarian Syndrome (PCOS) can present with irregular cycles but this is a diagnosis based on several criteria and is reached after the exclusion of other causes.
I attached a link to an article on PCOS that may help with answering your question.
All the best.
http://sunnybankwomens.com.au/Blog/Polycystic-Ovarian-Syndrome
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