M.M.
You mean there are several viruses going around that are causing "natural fevers" in the children. Yes this is the case. It is always something going around. The good thing is you can not get those same type of viruses twice, so once they run the course you are good to go.
I would first move to a motrin fever reducer. Motrin (either brand or off brand) tends to work better than Tylenol (brand or off brand). You can even alternate the two. Keep your baby cool. Dress her in just her diaper. Nothing more. Even though I know cuddle time is nice right now, be careful with the cuddling. Only one parent and not her between two of you, especially in bed. Cuddling actually warms the body. Your body causes hers to heat up more. Only allow her to sleep with a sheet on top. If she will sleep without anything that that is better. Keep her hydrated as you are saying you are doing... Do not worry about food. NOT even adults eat when sick. So not eatting is normal. Do not worry about nutrition. Jello, Popcicles, Freeze Pops, Icecream all make wonderful meals at this time.
Know 48 hours for a virus to run it's course is not bad. Most run the course in 3-5 days. So this is really not long at all if it is just Sunday mid day and this just started Friday... Remember fevers are good things. It means the body is naturally fighting off a forgin substance. I actually get VERY WORRIED when people are sick and fever free... Relax and congratulate yourself on her being healthy for almost a year and a half... You have great immune systems there lady.... Love her for us....