There are varied reasons for knee pain at an early age.. it would be definitely better to understand the full complaints and rupe out the probable cause for the problem.. Sometimes, it may be due to some sprain or injury inside knee which may be causing recurrent pain..
Next Steps
I will suggest you to start with hot fomentation, apply knee cap or crepe bandage over knee for support.. Take analgesic,
calcium and
vitamin d supplement.. she may require some investigations depending on the condition..
Health Tips
Avoid heavy work, avoid sitting down, avoid excessive bending of knee, avoid Indian toilet..