I would suggest she consult a cardiologist. The two problems may be unrelated. The absent pulse (asymptomatic) at the wrist could even be a congenital absence of the radial artery, even though the ulnar artery at the other edge of the wrist is fine. If the pulse is absent higher in the arm, or diminished, we would think of causes of relative obstuction higher up e.g narrowing (stenosis) of the subclavian artery . Medication alone should not cause any difference in pulse pressure between right and left.
The missed beats may just be innocent ectopics from the heart, but important causes such as atrial fibrillation would be diagnosable by cardiologist with ECG (EKG) and / or continuous Holter Monitor.