The only treatment for this trio of defects (commonly called "tetralogy of Fallot") is surgical correction, and the rule of thumb in many centers is that the child should have the strength to turn herself over without help. This is a very old standard, however, and depends upon the center charged with the care of the child. The only other treatment is supportive, that is providing oxygen, nutrition, etc.
Your friend's best bet would be to try and have the child moved to a more advanced center which specializes in these difficult cases.
I hope this is of some help to you.
John Kenyon, EMT, CCT
Non-invasive cardiology tech, Emergency and Critical Care technician, Critical Incident Stress Mgmt. specialist