My Mother Has Congenative Heart Failure And CoPd.she Is 83

My mother has congenative heart failure and CoPd.she is 83 and smoked heavily most of her life. Her shortness of breath and ability to walk very far is declining rapidly. Her doctors have said her heart is enlarging. I understand this the normal progression. I wonder if oxygen would help her. I think she may be not using it out of vanity but have also read her lungs and heart may not process oxygen right so more would not help. Should I push to get her to use oxygen to be more comfortable.? YYYY@YYYY