Guts

All three wounds involve the abdomen, which is home to some important bits and pieces. They overlay the appendix, caecum (connection between small and large bowel), and potentially bladder, right ovary, and uterus. Damage to these mean that in addition to introducing infection, blood loss, and functional impairment; there is now potentially early (liquid) poop, late (solid) poop, and urine leaking around the wound into the abdominal cavity.

Early poop is full of chemicals to help break down digesting food into nutrients we can absorb. Like urine, acts as an irritant to the tissue it contacts. Formed poops later in the large bowel are full of bacteria, a ready loaded source for overwhelming infection to develop from. Fixing these structures to contain the problem would require some big surgery in a sterile environment. A surgeon would potentially want Arya to get a blood transfusion if she had bled out too much (which can cause things like heart attacks left untreated); antibiotics to prevent/treat infection; and advise minimal parkour.