A few people have mentioned that he should act less like a parent and more like a brother. I disagree.
It seems like he has tried to talk to her, and isn't acting like a full-blown parent. He knocks before entering, and he didn't just hastily shut down her computer privileges as punishment. It appears that they have different interests, so it may be hard for them to develop a good sibling relationship; I don't think any of us know for sure.
If his mother is having problems disciplining her as an only parent, and she is acting disobedient and disrespectful despite relying on him and his mother for certain privileges, then I support his actions and thought process of trying to ascertain exactly what is going on in her life to make her act this way. I can imagine it would be easier on his mother if his sister communicated a little more. He has good intentions.
As for whether she is using drugs, I agree with the general sentiment. She may or may not be, it is tough to tell from the information you provided.
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