Fasting glucose level of 110mg/dl is impaired fasting glucose.Between 100 to 125 mg is impaired fasting glucose or pre diabetic.
126mg and above ,is
diabetes.
It's unlikely that your mother is having dizziness due to her glucose levels.
One has to decide if it's true dizziness or light headedness.
Both do have various reasons.low BP is frequent cause of lightheadedness.
Next Steps
consult with your doctor to evaluate your mother to determine the cause of dizziness.