I wear glasses all the time. Recently I got a new pair. The prescription wasn't very different at all (my old frames were getting kind of wobbly). When I received the call that my new glasses were ready, I went to the store to get them.
Put them on, and wow, I thought I was drunk. Double vision, distorted vision .. it was awful.
The rep took them back into the lab and sure enough, they had been measured wrong. The prescription was correct, but somehow the point where they measure your pupils and make that the central part of the lens had been made wrong.
I had to wait a day or two, but when I went back, it was a night-and-day difference. I still noticed a slight distortion but the rep made a tiny adjustment to the piece that goes on my nose, and voila, perfect vision.
So I suggest you take the glasses back and have the optometrist double check them. Probably the prescription is correct, but there are so many things they can check (where her pupils are, how she's wearing the glasses, etc). She needs to show the optometrist how she wears them because some people wear their glasses too high or too low and that affects how the lens has been made, and that can make the vision distorted.