This smells like blame-shifting to me.
She did not have a “slight fever”. Everyone’s body temperature varies by about +/- one degree from average during the day. A bit of exercise — say walking to the parking lot during a hot Texas day — may raise your temperature further.
If everyone with a temperature of 99.6*F (at some point during the day) were quarantined — then nearly everyone would soon be quarantined.
BTW, when Daniel Fahrenheit created his euphonious scale, he determined that 100* was the average human body temperature. We now know it to be closer to 98.6* — but you don’t have any sort of a fever, if your temperature is under 100*F. If you have a slightly elevated temperature, and are feeling other symptoms (chills, nausea, etc.) then you need to be concerned.
You’re certainly not wrong, but under the circumstances, common sense should demand caution. Everyone involved should have demonstrated more concern.
I jokingly say my normal temp is more like 96.8, but that’s pretty close to being accurate. I feel icky at 100.
If my temperature ever goes up to 98.6, that means I’m sick. I normally run 96 - 97. Point is, there is a range of normal temperatures, so judging whether someone is sick or well by taking temps is a formula for disaster.
Kinda like polling: within the margin of error.