Explore this forum. Eyesight improves with good nutrition and good habits. There are exercises that your daughter can do to improve her vision. A lot of people have used the Bates method with great success. I have not heard of anyone's vision improving with wearing glasses. I've only heard that people require stronger & stronger prescriptions over time. & You won't be done with buying glasses with one pair, either. Children break & lose their glasses all the time...maybe they don't want to wear them? Check out this forum & look for the book...
Here you go, here's a link on the Bates Method for you-