Please have the ECG reviewed by the treating doctor or a cardiologist, particularly if this is new, if she takes medicines that slow the heart rate such as beta-blockers, diltiazem/verapamil, or digoxin, or if she has thyroid/electrolyte issues.
Seek emergency care now if she has chest pain/pressure, shortness of breath, fainting, marked dizziness, confusion, sweating, very low blood pressure, or worsening weakness. The
AHA guidance on bradycardia lists these as warning features when a slow heart rate may be causing poor blood flow.