That's not high blood sugar at all. Little to worry about imo. Unless it was a fasting reading then it may be a little high depending if she had eaten or not. Keep it monitored if you can, if it goes higher regularly then there may be an issue otherwise it would be fine. You have to determine what was consumed pre test.
"Normal and diabetic blood sugar ranges. For the majority of healthy individuals, normal blood sugar levels are as follows: Between 4.0 to 6.0 mmol/L (72 to 108 mg/dL) when fasting. Up to 7.8 mmol/L (140 mg/dL) 2 hours after eating."