Check her iron,
vitamin D,
vitamin B12,
calcium,
Hba1c, RA factor, X-Ray of bilateral knee.
Need some more details,
she had knee pain ,
any of the above mentioned factors are unbalanced condition it's leads to ache and pains.
You can check x ray of bilateral knee.
With these we can get a clear picture about current condition.
Treat the root cause,
Associated with knee pain, may have chance to get some other issues also.
For that purpose investigation required.
After that need thorough examination and authentic way of treatments are required
Next Steps
Consult with me directly or online consultation available.
If she can't come directly, will do online, and pain becomes bearable condition will do Direct consultation and refer for treatments