My Daughter Was Born With Transposition Of The Grand Arteries,

My daughter was born with transposition of the grand arteries, 3 holes in her heart and an pinched aorta. She is now 16 and has had no other operations other then when she was 10 days old. He now has a cardiology appointment at sick kids and her cardiologist is no longer there. They assigned a radiologist specializing in neonatal radiology. I am concerned.. Why?
MaryAnne