My mom had C-sections as well and her scar is horizontal, very low on her belly. The C-section linked to, the vertical cut like that, often happens when you need to get the baby out rightfuckingnow. My friend's mom has one like that--the cord was wrapped around the baby's neck a few times, and they had to cut the mom quickly and without anesthesia. There wasn't time for it to kick in. *shudders*
I imagine the scar will heal a little more, but as far as the large vertical incision? That happens from time to time when something goes wrong.