Whom to consult for edema leg ankle.

Respected sir Please guide us My mother is diabetic and hypertensive. She has edema in leg. Endocrinologist has suggested ctd 12.5 mg od but she developed mild hypokalemia 3.18 . He suggested to hold ctd and monitor BP. It's due to pioglitazone as per endocrinologist.so he stopped pioglitazone. Coronary angiography normal ( it's done in emergency because ECG changes occur) Echo normal Kidney profile normal Tsh normal Venous doplar is normal Ddimer is normal Lipid profile was normal CXR is normal Whom which specialist doctor we consult for my mother for hypertension and edema ( leg) . Please guide us. Should we consult DM  cardiology for it ? We would like consult cardiologist for hypertension and Leg swelling? Is it right specialist to consult for my mother's problems?