Or, Carl did shoot her, but the bullett just grazed her. Then Carol would have to sew up a field cesarean and then get Lori out of that room.
Seems impossible, doesn't it?
Well, 88% of field amputations during the Civil War [which IMO is the most apt comparison to the prison in TWD] died from that amputation. So, Herschel beat the odds. Perhaps Lori will as well?