Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
I know that the influenza virus as well as the many other respiratory viruses cause elevated temperature, not reduced temperatures.
In addition to fever, the
influenza viruses cause coughing,
sneezing,
sore throat, muscle aches and pains,
pneumonia. If the only sign of illness was the temperature fluctuation you describeD then I don't believe you need to take her to ER now.
If you do not have a hand-held battery powered thermometer, then the best way to take a young child's temperature is rectally with glass bulb thermometer.
After lubricating the bulb end with Vaseline ointment, spread buttocks and gently insert thermometer about an inch (2.5 cm) into
rectum. With one hand, hold thermometer in place and with other hand, hold her down on her belly. Remove thermometer after 2 to 3 minutes.
Remember to shake down thermometer before use. You can give her a fever reducer if her temperature goes above 101°F.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Arnold Zedd