J.✰.
if tylenol isn't working, try ibuprofen. I always give my son ibuprofen, using tylenol only if need-be. I hope your daughter is staying hydrated. When my son is sick I up the 100% fruit juice and offer fresh berries and banana and oranges and apple. They're jam packed with vitamins and can help fight off whatever's going on. My son loves fruit and it's a nice 'treat' since they can be expensive a lot of the time - so we don't buy them often.
No, I've never heard of a fever for 6 straight days. I hope she is getting lots of good rest, as that will help her body fight it off too. Are you staying home and taking it easy?
When my son's temp is at 99.-something I rarely give him any meds. His fever is there because his body is fighting the bug (whatever it may be). The only time I give him meds to lower his temp is when it gets too high - in the hundreds. At 100.6 I maybe wouldn't have given your daughter anything and just let her body fight whatever's going on. If it crept higher into the 101s I'd give meds.
Good luck. HTH. Let us know what the diagnosis was in the "So What Happened."