A 72-year-old woman with a history of myocardial infarction 2 years ago, currently on dual antiplatelet therapy and a beta-blocker, presents for urgent repair of a strangulated inguinal hernia. On examination, she is alert and oriented, blood pressure 142/90 mmHg, heart rate 88/min regular, respiratory rate 18/min. She reports mild dyspnea on climbing two flights of stairs but denies chest pain or syncope. Recent ECG shows old inferior wall changes. Troponin is normal. She has no fever or signs of sepsis. What is her ASA Physical Status classification?