Hello, My 10 Year Old Daughter Was Diagnosed With Pyelonephritis

Hello, My 10 year old daughter was diagnosed with Pyelonephritis and Mesenteric adenitis and been on antibiotis for 7 days now and been in the ER twice since then to have IV medication put in because she can't hold down any fluids keeps vomitting it up and now has a pimple like rash on her thighs no fever just chills and pain on left side and in back as well why is she getting worse? shouldn't the antibiotics help?