Diastolic dysfunction. By any chance?

My sister 26 years old has diastolic dysfunction grade 1 and borderline lvh. Her ejection fraction has reduced from 65% to 60% within a year. She is suffering from high bp and is taking her medicine regularly working out regulary. But since some time, she is able to notice clear swelling in both her feet and the swelling reduces after work out. Apart from that she often suffers from chest pain and pain often radiates to her left arm. Apart from that since past 3 4 days, she has started feeling tired a lot than usual. She feels shortness of breath and sudden fatigue. Her 2d echo shows no structural change. Her tmt reports are negative for MI and normal. Her ecg comment is no significant stt changes. When we showed these reports dr told that her heart is fine and everything is normal. But now her symptoms have worsened. Does she have any heart related issue? Does she have heart failure with preserved ejection fraction by any chance? Please let me know. Help her.