Hi friend,
Welcome to Health Care Magic
Absence of pain at present does not exclude heart problem.
This is especially true in diabetic.
Your mother must be investigated for Coronary
Artery Disease.
The next step is
stress test – TMT (Treadmill Exercise ECG) / preferably with thallium isotope – will be the ideal way to evaluate
ischemia.
This is to assess the physiology (function).
If there is a suggestion, the next step is to see the anatomy.
She must undergo catheterisation and coronary
angiography with a view for possible intervention.
Coronary arteriography is invasive but it is the gold standard for this.
[CT angio is non-invasive study for the anatomy. If positive, she will need catheterisation, anyway.]
Take care
Wishing speedy recovery
God bless
Good luck