Your daughter's myopia
comes in the category of high myopia. There could possibly be a family history of myopia. Firstly, it is important to note that the vision in both eyes should be normal or close to normal without one eye being better than the other. If that is so, then she may need certain treatment for the worse eye. Her spectacle number will, in all probability keep increasing. How high the spherical or cylindrical part goes is impossible to predict. LASIK ( laser in situ keratomileusis
) used in adults to abolish or reduce dependency on spectacles is not done under the age of 18 years since the refractive error
has not stabilised. The option available to your daughter is something called AOK or accelerated ortho keratology which is essentially a rigid gas permeable contact lens
used in the eyes at night while sleeping that aims at moulding the cornea
for better vision.It may also slow progression. Generally,it is best used on people with myopia around -6D but may be tried here as well. I recommend an investigative tool called Corneal topography to map the corneas in your daughter as well. She also needs a detailed retinal and intraocular pressure
evaluation approximately 10 to 12 monthly. Try to fit it into the birthday month so it becomes a routine. As long as her vision remains good and the retina fine there is not much else that can be done except wait till the power stabilises and then opt for LASIK or other surgical correction based on the position at that time. All intervention other than AOK is done after 18 years of age.