IMO there is no reason this should be an 18+ game anyway. Yes there is shooting computer generated people, and a little bit of blood, but there is no real gore at all.
To compare it to games like GTA or anyting of the sort is not righ in my opinion. There is no way a 10 year old is going to go and grab a gun and start rampaging after playing this game without underlying roblems.
ANd as Mary says, it is probably a good thing in this situation anyway. She is in contorl by the sounds of things (i know, you said you acknowledge this
)
on a side notek, my PSN name is foghorn0leghorn and i will probably be on it from 4pm til some time friday morning if anyone wants a game