It's a low-grade fever and is coming down w/ medication. She's acting fine and staying hydrated. I would wait and see how she is in the morning. Then, call your doctor if you need to. Since the fever started Friday night, it has been just under 48 hours so waiting until tomorrow morning is still less than 72 hours (and the medicine is working).
She could have an ear infection (my daughter never shows symptoms...the doctor either stumbles on it or she finally complains when it is over the top bad). Since the fever isn't bad, keep in mind, medication isn't necessary since you should only treat the fever if it is high or to make the child comfortable and if she is goes to school or daycare, she will need to be fever free without medication for 24 hours.