Here's a link on pyelonephritis to read.  It really sounds like she needs to be in the hospital on iv. fluid therapy and antibiotics by injection.  I hope she is not in any pain.
  http://www.healthatoz.com/healthatoz...onephritis.jsp 
I also had a bad experience as a child (about 15).  I had a rare form of cancer and it had sealed itself off in a bag and had become gangrenous (sp?) and it was trying to rupture and I was in terrible pain.  They told my Mom I had the stomach flu and was over-reacting; however, they did give me a shot of demerol.  My Mom took me the next morning to get an ultrasound done which showed the tumor (the size of a grapefruit)! 
Don't you have a sister, friend, sister-in-law, mother, MIL, anyone that might be willing to stand in for you.