Kindly do a scan

It is due to change in harmones. Take tab trapic 500mg twice to thrice  in a day. If not stop need harmonal support

Bleeding in this age needs to checked by a transvaginal ultrasound and Pap smear and thyroid test. For stopping the bleeding you can give 1. Tablet Trapic MF 1 Tablet three times a day for three days 2. Take high protein diet like 1 egg daily 3. Cholecalciferol sachet 60K Twice a week for 6 weeks and weekly thereafter 4. Iron rich diet

You can give her Trapic 500 twice a day.but show her to a gynaecologist or consult online..she will require a scan too..