does it reduce fluid, swelling and short of breadth

My mum suffers from heart failure and in addition to 80 mg lasics daily she also takes 2.5 metolazone but continues to have swelling on the feet, angina in the nights  and she is short of breadth...I want to know how i can help her with the use of metolozone or another mediceine to go with it to help reduce the swelling, angina and reduce panting....or being breathless. THANKS