The thing is, if your child is ill often (like mine), you sort of start recognising their patterns, temperature patterns particularly.
For example, I know that if my sons go above 38, it will not get better without antibiotics. I also know, that even after they get meds, the temperature will still be high for another 2 days at least, in the region between 39 and 40. Night time being the worst. So, you knowing your child best, and seing that the temperature is coming down, could chose to wait till the morning.
However, in my experience, Nurofen takes around an hour to work. Last night my son had 39,5, I gave both nurofen and calpol together, undressed him to just underpants and his singlet, opened the windows and turned off the heating. It took an hour and a half for the temp was down to 38, then 37.5, and I went to sleep next to him. This morning he was brighter.
Seems like you are doing the right thing, BUT if at any time she gets short of breath in her sleep, or her breathing patterns become erratic, or she gets blue around her lips, or her chest looks sunken, I would lift her pronto.