As a general rule of thumb Pass, temps up to 38 can be left unmediated if toddler is not in distress, indeed it is good for them to have a temp to fight the bug. Over 38 I medicate as mine vom and get very distressed with it. Mine have all had temps up to 40 and just over, and that is terrifying, but I am getting used to it. Febrile convulsions are more to do with the rapid climb in temp rather than the very high temp.
The highest temps both my girls have had were just prior to the pox, and there were no other symptoms like a cough or streaming nose.
It sounds as if P is coping admirably. She is a tough little cookie like her Mummy. It is very reassuring if they are bright and active. When they have a vacant look or are delirious, that is horrid. I have only once called an ambulance (at home anyway) and that was with DD1 as her temp was through the roof, she was slipping in and out of consciousness, and she didn't recognise me. The little sod was fine by the time they arrived, and I felt such a tit. They were lovely though, and said they would rather come out 99 times 'unnecessarily' than miss one little one who was seriously ill.