Welcome to healthcaremagic.com. Good day, the symptoms and physical finding would point towards
heart failure, but the heat from the legs/swelling goes against this, it could be a contributing factor however. I would worry about a blood clot in her leg.
1. I would have heart failure ruled out, does she have
shortness of breath, how many pillows doe she sleep with, how far can she walk and when did these changes occur. If there are positives and difficulties to exertion she probably also has heart failure.
2. For the blood clot hypothesis, does her calf hurt, did she recently have an injury, did she have a long travel by plane or car ride, does she have a
rapid heart rate.
3.
Peripheral Vascular Disease can manifest this was, she would have the blotchy skin findings,
varicose veins.
I would have her see her regular physician as there are specific physical exam maneuvers that will nail the diagnosis.
Good luck in your medical career and I applaud you for being vigilant, good luck and thanks for your question.