My daughter is 14 years old and her periods are...

Dear Customer
Evaluating the answer from the top of the page after reading it helps us to improve the quality of answers and ensure that the best experts are available to help you .
What is natural of period during adolescent females ?
especially in first years of period 12 - 18 , irrgular and and long periods are normal unless its proven otherwise , so your child medical condition is normal and you dont have to worry 
Does you child to take any medication ?
as you mentioned , all your child test are normal , so we only suggest the following ;
1. follow doctor instructions about taking suppliments such as hymaliya eva care 
2. do blood test every 3 months to make sure doesnt get anemia 
General advices to cope with period :
1. have plenty of water 
2. have a rest 
3. avoid stress 
4. have healthy food 
5. for period cramps , exercise may ease the pain 
You can also ask our other certified experts in various fields such as: Nutritionists, Lawyers, IT Experts, Therapists, Mechanics, Doctors, Handymen, and more.
Kind Regards

Is it ok to take daflon to stop period in your daughter case ?
yes , its ok take medications to reduce period bleeding 
What are the other options ?
1. medications to reduce period such as tranexamic acid
2. hormonal therapy if period bleeding start causing more severe symptoms 
How to deal with the stress that is caused by irrgular period ?
1. first step is to explain to your daughter her situation , and giving her knowledge to cope with her current situation 
2. support your daughter , and be with her in need 
3. inform her this issue will be over soon , and stress may effect it in negative way , so avoid stress is the best choice 
best regards