I don't understand why anyone is telling you to wrap your child in a blanket when she has a fever. Anyone who has ever had a fever knows that wrapping up in a blanket doesn't even help. It's not a cold chill. It's the body reacting to the fever. A blanket will not help, it will only make her fever rise. Give her Tylenol or Motrin or both. Ask her doctor about piggy backing the meds. Recently I had to take my 2 year old to the ER because his fever got up to 104 and I couldn't get it below 102. They made me unwrap, and undress him down to a diaper. I didn't even think of putting him a cool bath. Wish I had because that's one of the things they did with him there. But also they piggy backed his tylenol and motrin. He was given a dose of tylenol and when his fever didn't go down they gave him a dose of motrin 45 minutes later. I'm not telling you to do that without the advice of your child's doctor though.
Have you considered that your daughter's natural body temp may be lower then 98.6 (my husband's is)? If that's the case then a 100 degree temp is higher for her then it is for most. So she needs meds to bring it down. Your daughter could also have a virus causing her fever. Obviously there are no antibiotics for a virus. You just have to wait it out. In the mean time you will need to give her meds or a luke warm bath, or just a cold wash cloth on her forehead. Even if she doesn't like it. Then once her fever has broken you can comfort her and wrap her in a blanket. Hope she's feeling better soon.