Is coronary angiography required in chronic stable angina?

Hello doctor,

My mom is 56 years old. She is a patient with hypertension, diabetes, and mild nephropathy. Her BP is 140/80 mmHg, pulse is 96 beats per minute, creatinine is 1.3 mg/dL, fasting sugar is 125 mg/dL, postprandial is 157 mg/dL. For a few months, my mother has been suffering from chest pain. The doctor said it is chronic stable angina. All other tests are done, like Na, K, hemoglobin, urea, and uric acid. The reports are quite fine. Our family doctor suggests I get an angiography. So, what should I do now? Please suggest. She takes the following medicines such as Aciloc RD, Glimmy 2, Nexovas, Telmikaa 40, Febugood 40, Lipikind 10, and Glypten 20.