High sugar levels will make you drowsy.
Depending on when she tested, ideally fasting or 2 hours after meals, her results should be less than half of that.
Diet will play a massive part, so cut out the sweet stuff, cut back on carbohydrates, pasta, bread, rice, potatoes, cereals and even healthy things like fruit juice, bananas and grapes are high in sugar.
Get a GP appointment ASAP but if you need any more advice please just ask
And let us know how she gets on
Cara