Yeah definatly not,regardless of wether it was over heating or just at running temp, shes lucky she didnt get scalded by the antifreeze.Did you tell her to look at the gauges?Any Check engine lights?if it did over heat,its probably just the thermostat.But i dont understand the reving to 6k part,is it an automatic?if so it could be the transmission slipping...If its not then you may want to check the clutch,women and cluthes dont generally get along.They tend to slip the hell out of them when they put on their makeup