"If a child waits too long to take the pill... a fertilized egg could reach the uterine wall and become implanted, after which the drug is useless."

"You see how the word 'child' keeps getting in the way."

There’s no point debating whether such young girls should be sexually active. Obviously, given the potential consequences, both physical and psychological, the answer is no. 

Potential consequences?

It seems to me that when you're talking about girls under the age of 15, if there is an occasion to buy a morning-after pill, there is an occasion to report a serious crime.