Its quite normal to not have period just after puberty even up to 1 year. If she do not have any other symptom like pain in abdomen, no need to worry. White discharge is a common problem, take care of her nutrition, health and hygiene. Can give
1.Amycordial syp 2tsf twice daily after food.
3. Amyron syp 2tsf twice daily after food.
Next Steps
if White discharge is excessive, consult a doctor for medicine.