I believe if she views the movie with the glasses it will filter out the other image and her good eye will only see a single image. Without the glasses she would see a double image. My father had also lost an eye and was unable to see the 3d effect so I can sympathize with you.
Waltm is correct, as long as she wears the glasses she will see a proper 2D image. It will be slightly dimmer than a true 2D theater but should look fine. Without the glasses she would see a ghosted image.
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