Because she is practicing the methods and is not
permanently and completely cured yet.

One of the most important things in the methods of
the natural eye is that one must practice at a distance
where the vision *improves* most. And then when that
improvement is quite permanent at that distance one
must practice at other distances.

This is fundamental.

If you put yourself at one feet from the card and
you gain a couple lines (assuming you couldn't
see them before) you are improving and using in
the right way your eyes. Continued practice will make
you improve at farther distances until you reach the
standard distance or more.

BUT, and this is a big BUT, it could be the other way
around also; one could find that the best distance is
MORE than the standard distance and find that he
improves a couple of lines (for example from the big
letter to the next) best at that distance. Then he must
continue to practice at that distance.

As you can understand, the original Bates' system
methods are waaaay different from the bullshit that
the so called teachers go on preaching and the so
called professionals go on bashing.

Intelligence and careful  reading of the instructions
are needed to succeed in the cure of imperfect sight
by treatment without glasses.

--
"It is not faith that cures, but a proper use of the eyes."