A female client with type 1 diabetes mellitus, receives a dose of insulin lispro SUBQ per sliding scale at 0800 because her fingerstick serum glucose was 180 mg/dl (10.0 mmol/L). At 1000, after eating 25% of her breakfast, she reports having a headache, nervousness, tremors, and is perspiring. Which action should the nurse take first? Reference range: Blood glucose [Casual/non-fasting: Less than or equal to 200 mg/dL (less than 11.1 mmol/L)]