@allison, thanks for the reply. I actually meant pulling all her shoes and seeing how she does completely barefoot. I guess my wording sounded kinda funny saying pulling the back shoes. I only mentioned pulling the back ones though because that's currently all she has on. She managed to pull both front shoes this past week. The front left was lost first, and it was also the same one that was lost just a few weeks earlier.
So far she doesn't seem sore and both shoes came off cleanly. I have the farrier coming tomorrow because he was going to replace the original lost shoe, but now that she has pulled the other i'm wondering if I should just remove the back ones as well and see how she does completely barefoot. I'm considering this because if losing her shoes is going to be consistent, it will not only cost me quite a bit but it will also just continue to weaken her feet.