From what I see there, she ran across a patch of sharp (probably glass) objects, and cut skin off of her paws. I see a reasonable thickness of skin outside the area of damage. So, my previous assumption of thinness/weakness in that area was incorrect, and didn't happen from just a desperate dash away in fear. It would have been a LOT worse if that had been the case. In fact, there's NO telling what she ran into out there.

My (presumption) of her running over Glass presents an additional problem.
IF that was the case, with her trying to lick/clean the damaged areas, she may have swallowed some glass. Was there ever an X-Ray taken of her intestinal tract ? However, IF there was anything there that could cause a problem, it is very likely it (blood discharge from anus) would have shown up by now. Possibly a Fecal Swab and check for Blood would be in order at this late date.

I can see that healing well in time.