The combined VISION THREAD is now well over 700 posts in length, and is a great deal to wade through for this information.
Much better to print off this
Vision | Medical | Safety Regulation
and give it to your daughter's friend with the advice to check it out with her optician.
Simple mild to moderate short sight (myopia) is certainly not usually a bar to a commercial flying career if it can be well corrected using spectacles or contact lenses.