Apparently all the other girls at school have seen it about a million times and she feels really left out .
I've looked at the BBFC listing and it doesn't sound like the right kind of fare for a 9 year old. But it does seem to be enormously popular with little girls. AIBU? As far as I can see, this is a film aimed at women, not at girls in primary school.
(and yes I do remember the utter humiliation of being the only one in my class not allowed to watch Jaws at the age of 9 - I did get over it)