E.W.
I don't think that it would hurt to go ahead and call the pedi, I am sure they have an after hours service. But if I were you I would alternate Ibuprofen and Tylenol, one every three hours until the fever was gone. Both of them I think are every six hour doses, but it is perfectly fine to rotate between the two of them giving her one every three hours. This is usually what my pedi has me do to break a fever.