Hi K.!
There will probably be alot of different opinions on the "sleeping" Issue of your problem, so I will share my opinion/experience with you :o)
Especially the first time our babies are sick we are extremely saddened. Mostly because we can't "help" them feel better faster. I comforted both of my boys in similar ways to how you sound like you are comforting your daughter. My thoughts were "whatever makes them more comfortable" is what I was willing to do.....including rocking more, holding more, etc...
We were successfully able to get back to normal sleeping schedule, however, it did require some work similar to "starting over". I knew that may happen, but was willing to go through it LATER in order to comfort in the NOW. So try not to be hard on yourself, because producing a secure, happy, comforted baby is more important right now :o)
As far as the eating goes, usually the Dr says eating ANYTHING is better then nothing. Just try to get anything into her system to avoid dehydration. Popsicles (make some if you have to), get a "food net rattle thing" and put her favorite in there. She can suck on it and get something into her system.
I'm sorry your little one is so sick. Life can be miserable for a mom at those times (no time to shower, eat, or anything). Hang in there, and make yourself "proud" that you were patient and loving enough to go through this with your daughter.
Best Wishes,
:o) N.