Sorry, I only skimmed the other replies. When you walk this horse on even ground, pavement or concrete, does she land heel first, flat footed or toe first?
My horse was wearing the snot out of the toes of his hind shoes at one point with farrier #6. He said it was just how the horse moves. I didn't bother to tell him it never happened with the other 5 farriers before him. It was the trim. Toes too long and heels left too high. If your horse is landing toe first, you have either a trimming imbalance or a problem higher up the leg. It hasn't happened since.
You just have to see your distance...you don't have to like it.