It's normal to second guess everything you do. You're doing something, so that's the right thing to do. In the end, what's supposed to happen, will. You're doing everything you can and sad as it is to say, that's a lot more than so many pigs around the world get.
You're a great mama, and you must know how much she loves you no matter how it turns out. She knows how much you love her, too.
I know it's easier said than done, but try to calm down. She can feel your angst and it won't help her.
Mine, Leo and Jack's thoughts are with you, hoping for a full and speedy recovery for Eri.