I think the movie rated PG. Not sure, but I wouldnt watch the movie with children 1st until you see it for yourself and to see its suitable. For me i felt just pre teens and up because they talk about stuff kids wont understand yet.
Spoilers ahead
I didnt like when she was acting weird hiding under bed drawing about the guy and im like um ok cringe. And she over reacts about her mom going to see the notebook. Just put it away, you're make it obvious.
Then when she was turning into red panda, that dark weird stuff pop up. Like her drawing of the guy, like weird stuff like even i think a dead bird? Um what the heck with that. If I was younger i'll be creep out by that.
Just the beginning of it was weird. And the kid that got attack by her was like man he got all cuts everything from her. Maybe it should be pg 13, just thinking about it.
They also have period talk also too. I know its a normal thing but like I said watch the movie 1st before showing to children.