From the history given by you, we appreciate the concern you have for your mother-in-law`s health. We would suggest u to see your doctor if you experience any of the signs or symptoms associated with heart failure. These include fatigue and weakness, rapid or irregular heartbeat, if she is short of breath when she is at rest or when she lies down, reduced ability to exercise, persistent cough or wheezing with white or pink blood-tinged phlegm, swelling in your abdomen, legs, ankles and feet, difficulty concentrating or decreased alertness. Then Contact your doctor promptly.