Grow, maybe this will help your daughter:
In New York, headlight flashing is not illegal. New York Vehicle and Traffic Law Section 375 [3] requires that headlamps "shall be operated so that dazzling light does not interfere with the driver of the approaching vehicle".[31] In 1994, New York Supreme Court, Appellate Division held that flipping or flicking high beams at approaching vehicles is insufficient to cause the "dazzling lights" prohibited under New York Vehicle and Traffic Law Section 375 [3].[32] In 2009, the New York Supreme Court held that the flashing of lights alone is not a violation of New York Vehicle and Traffic Law Section 375 [3], that stopping a vehicle based upon that is illegal, and all evidence gather as a result of the illegal stop should be suppressed.[33]
The 2009 case is here: http://www.courts.state.ny.us/reporter/3dseries/2009/2009_08412.htm