Thank you for the input.
Growing pain usually occurs in knee, ankles, calves, legs, thighs.
Abnormal site can be possible too.
Sometimes children feel abdominal pain, headache too.
Inflammation of the disc can be possible from overuse, strain.
Carrying heavy back packs can be a factor.
Though she had X-ray last year, but she is feeling the pain more frequently.
You can seek an appointment for a pediatric orthopedic doctor.
Scan/ MRI can be taken if the doctor feels necessary.
I hope this information will be helpful.
If you have any query, please feel free to ask.
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Wish her healthy life.