There is no way at all that is possible. How could Carol, a personal with no medical experience, manage to stop the massive, massive internal bleeding Lori would be suffereing from having her stomach cut open, stitch her up, presumably stop the bleeding from a gunshot would, etc. and keep her alive with little to no supplies at all. It is just impossible. Also, if Lori comes back I will officially be done with this show. Killing her was the first thing they did right except for hire Morrissey to play the Governor in the past season and a half. I'm willing to suspend disbelief on some stuff, but there is no way I'll do it if it means my least favorite character in TV history is going to come back (although it would be okay if she did and then her and her babies fate played out like the comics)