Hi, I had gone through your question and understand your concerns.
Let me make you understand the biology behind the process.
The development of the eye and consequently for our
binocular vision to develop is 12 years. The eyeball has a specific shape. It adjusts its curvature till 12 years of age and hence the
eye power will fluctuate in the beginning years.
Her
refractive error (eye power) may increase also, but will attain a steady state by 18 years.
Take her to an ophthalmologist for annual checkup.
Get a
retina checkup done.
Ask her to wear spectacles regularly.
Her power will improve on its own.
There is no such diet which can improve her power or correct the refractive error.
Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.
Wishing your daughter's good health.