Has she had vaccinations recently? Just another thought.
My boys have had fevers before and nothing showed up but a rash after the fever broke. I guess it was viral, but the thing is, their fever was high like your daughter's (even though we were told it shouldn't go that high), but there was nothing else.
If you want to try and break the fever...it needs to do it's job. I don't give my kids any of that stuff unless it gets too high (over 103 or unless they are uncomfortable). Other than that, I let nature run it's course. There is a fever for a reason. The fever helps the body fight whatever it is fighting.
But, having said that, there are a few things you can do to help build up her immune system. Vitamin C is a wonderful way to flush out the toxins and reduce fever. For a child, I would use a calcium ascorbate form of it because it can produce diarrhea if taken too much. My 2yo is taking a fizzy powdered drink mix (can get from Wal Mart or your local health food store) that is 1000mg of vitamin C. I stir in two packets in her big sippy cup and she drinks that once a day. She began a runny nose on Saturday and now the runny nose has stopped, but I'm continuing to give it to her because I know that her body is not yet rid of the cold, but at least her runny nose has stopped. (Vitamin C is wonderful.)
You can help break the fever by giving her a Yarrow Tea bath or even having her drink a bit of it (I'm sure you'll want to sweeten it or mix it with something else.) Definitely stay away from dairy.
Other suggestions:
Catnip tea enemas daily to help relieve any constipation and congestion. C and C will keep the fever up.
Elderberry tea and hot steam baths could help.
But honestly, if she were my child, I would be giving her something to boost her immune system. Whenever, my kids get sick (which is rare), I automatically give them capsules or powder or chewables of something that will boost their immune system to fight whatever is attacking the body. Your daughter needs help to fight whatever problem is going on. Her immune system is weak...children's are. We use Beta Glucan in our house and I've opened up the capsule and mixed with orange juice plenty of times (I've used it for strep, etc., so you see this stuff works.) Vitamin C is another good one and getting some liquid form of an immune booster at a local health food store can help a LOT! Good luck and I hope everything gets better soon.