So what if she is 6 years old? Terrorists don't care if they a 6 months old or 60 years old. There was an issue with the original body scan (I have read conflicting reports on whether she went through a scan or the parents opted out of the scan) so the next point in the procedure is the pat down. Where is the issue? It is done with the parents present and is over quickly. If you don't this to possibly happen to your child than don't fly. Flying isn't a right people, there are rules. If you do not like the safety rules (which everyone wanted beefed up after 9/11) then don't fly simple as that.
You can't have it both ways people. If you want security on planes these are the rules. You can't have that for all the people named Amir or people that have brown skin and not for sweet little 6 year old kid. The only way to do this is a rule that EVERYONE needs to abide by.