Extended time?
Answers: She wants to go to the doctor. This could be any number of conditions that are cause this. If she doesn't have a gynecologist..relate her to go to the local form department. They offer "kith and kin planning" services and will be able to assistance her for free.with or short her parents knowledge.
perchance she should call her nurse. The lone solution is for her to go to the doctor. This is certain as abnormal uterine bleeding and one and only a doctor can help her. With the loss of so much blood she stands a right chance of becoming anemic.
She must go and get this checked by a doctor or she could end up anaemic. During such time, over exertion if any,should be avoided.
However, 20 days time is longer. If this is repeated f0r the subsequent time,contact the doctor.
I had a friend that have problems like that
and she go to the gyn
and she found she had Anemia
consequently she had to thieve birth control pill to stop her period