Missed periods by 29days. Please help :)

My friend she has missed her monthly period cycle by almost one month. For her it was everytime on exact time and date i.e. regular. But this time she has missed her monthly period cycle. She had some low bp and all problem too because of that doctor has prescribed her multivitamin tablets for 10days apart from that her haemoglobin is 9.5. Further everytime she gets on her periods she really suffer alot from period cramps which makes her take 2 medicens which is voverin and meftal spas each of these that doctor only has prescribed. This time she is really worried she is not even sexually active then also she is having this problem and because of this problem she ll feel her bloating stomach too. Please help :) Thanks.