11 and obsessed with porn

So my younger sister is 11 years old and seems to be obsessed with pornograpgy. Since the age of about 7 she's always been caught watching or searching it. And I don't mean soft porn I'm taking the hard stuff. 
When she was 10 I found on my phone pictures and videos of a home made porno that she had done of herself. As in proper zoomed in detailed showing herself to the extent that she was cumming on camera. She was moaning and making faces and it was actually very disturbing to watch but I wanted to see everything she was getting up to. 
What do you guys think is going on??! 

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