Well, a "slight turn in the toe" is fixed by the trimming, not what you nail on the foot, though it's hard to know what your vet meant. Turn, as in breaks over funny, or turn as in the coffin bone deviates from the leg in a specific manner? Either way, the trim is what is going to change how the foot heals. Boots could be used instead of shoes for protection while riding. I'm wondering why the trims haven't been providing more relief, unless the tendon is bowed, but that brings me back to the trim helping along the healing, or is it the DDFT and the navicular bone that's affected? In which case, shoes are definitly not the answer, and it just takes time and very careful trimming, shoes may mask it for a while, but aren't going to fix it. Hard to say.
Good luck in finding the right balance for your horse and hope you get to ride and enjoy her!