Sorry to come in on this so late, but I did the contact lens version of short-sighted in one eye and long-sighted in the other for a number of years, and it was no problem for me at all. BUT, as mentioned above not everybody can adapt to that.
I know she's having problems with glasses, but if she can't experiment with contact lenses, how about getting glasses with two different lenses just long enough to see if her brain can handle the one short/one long eye method? It would just be short term - maybe a week or so? - just to see if she can handle two different eye corrections wit