from what you describe, normal cardiac exams with no murmurs
and a normal SAT are reassuring. However, it shall be interesting to continue to check whether lips become bluish on effort or when she plays, or if she easily gets tired.
Out of that, I think you should not worry. In case any of the above symptoms are noticed, a more invasive procedure like an ECG, Cardiac ultrasound
or a chest x ray
might be of help, and then your pediatric cardiologist could be of help great help.
Thanks and best regards,