Two Years Ago My Daughter Had A Tumor The Size

Two years ago my daughter had a tumor the size a little bit over of a quart jar removed from her one the heart doctor said it was starting to invade her other one as well they got it all out. It was benign. When she was small she had RSV at 3 months. However since she's been the age of six or seven she had started painting we thought getting the tumor out would have been the answer however yesterday she fainted three times in the morning. And we had a xray on the lines a month ago by our family physician and he said it looks clear. We are worried what this could be? She has painted many many times throughout her childhood and adolescent years she's had her heart like that she has done the tilt table test and now she's 21 years old she did failed at 8 to tilt table test but we thought it was because of the tumor. She still thinks please help she is cold all the time also.