What would you consider "Fever Free"?

My 2 and 3 year old both came down with a virus a week ago. After 3 days of fever my son(2) has been healthy but my daughter (3) has continued to have a fever off and on. I took her to the doctor who thought the same thing I had, just a virus and that she did not expect her fever to continue much longer. Yesterday (day 7 of fever) she was fevered part of the day (99-101) and fine other parts, eating and acting normal except for a little more sleepy when the fever was present. Today so far (knock on wood) nothing above 99.5 and she is acting fine. If her temp goes above 100 today I plan on calling the doctor back, but otherwise do you think a temp below 100 but above 98.6 would still be considered "fever free?" She has been cooped up a week, and is begging to be able to play with her friends. I don't want to risk exposing anyone to an illness, and was waiting until 24 hrs fever free to allow her to play with her friends, but wondering if I even need to worry with a slight temp below 100? What would you do?