Grrr this is a tough one. I would say let's tie her off so that the infection doesn't get the best of her but I'm afraid to attempt to because shes got such a wide open space with her belly botton. She'll have this huge hole there and thar can just cause more problems. Grrr she is making the choice very vey difficult.
I do think if you have some antibiotics perhaps lets get her started on it. Maybe maybe it would help. But water is going to be her number one priority right now.
What about letting it dry....or as gruesome as it sounds, opening the sac to let it empty, then tying it off? I'm grasping at straws here.