Vicente
Hello and welcome to HealingWell. Depending on the size of the ASD and the symptoms of the 3 year old will determine the physician's recommendation on how soon she needs to have the surgical repair. I cannot answer your question re if she needs surgery now..............I would trust in the 2 physicians that have done the tests and the medical screening exam on the child.
I wish you the best of luck and will offer prayers for the healing of this precious 3 year old.
Kindly,
Kitt