My wife brought my daughter back from the hospital this evening after a bag of IV fluids was given to her along with some medicine to calm her stomach. While she's got a ways to go—her energy levels aren't anywhere near where they normally are, she ate and kept it down! She was also singing, which is something she hasn't been doing for a couple of days now. The road to recovery has begun. We'll have to see what tomorrow brings, of course, but at least things ended on a good note.
Meanwhile, my wife is physically and emotionally spent after several days of dealing with this. She passed out rather quickly this evening after getting Gracie to bed. I'm probably not too far behind her as I'm starting to have trouble maintaining focus—a clear sign that I need to get to bed.