So sorry to hear this. What a rotten month for all of you. My daughter had some microperferations and associated infection last winter and was in the hospital for a week, and that was hard enough.
I don't have advice about the abscesses, but I can tell you a little about NG-tubes. We spent the first two months after my daughter's diagnosis trying to avoid an NG-tube, because it seemed like something that my daughter wouldn't be able to bear. When she was finally so awfully sick and malnourished that we were forced into it, it turned out to be so much better than we had imagined, and it honestly ended up giving her her life back. We are only sorry now that we didn't start it the day after she was diagnosed.
We had the tube placed in the hospital, using laughing gas and ativan to help her stay calm. The first 2 days after it was placed were difficult. My daughter's throat was very sore, and the tube just felt uncomfortable. Also, the original formula we used made her nauseated, and then once we found a formula that worked for her, we had to adjust the flow rate until we found a rate that didn't make her feel sick. All the adjustments took about a week, and then it was easy for her. She hardly noticed the tube, and she gained back about 20 pounds during 10 weeks using the tube, along with regaining energy and losing all abdominal pain.
After the 10 weeks was up, her doctor wanted her to continue supplemental feeds at night, and E was able to put the tube in herself each night, and remove it in the morning. I would never have guessed that she'd be able to do that. By June, she was up another 5 pounds, and Remicade had finally kicked in, and she was able to stop the tube feeding.
So, I guess that's a long way of saying that NG-tube feeding can be extremely powerful, and I would definitely give that a try before surgery. Even if your daughter does eventually need surgery, the tube feeding can help give her the strength to be able to recover well from the surgery.
Best of luck with whatever you decide to do. My heart goes out to you and your daughter, and I hope that she gets some relief soon.