You sound like my brother who once saw me reading a goyish book (I was about age 13, he; 19) he grabbed it out of my hand, said Ich and threw it into the garbage. (It was a clean garbage can so I took it out and continued to read 🙂 ) The difference is a. I’m not his mother, and b. he barely knows what internet is and would not be busy posting threads on the internet! (He knows I have internet and did not try to disconnect the wires yet… 🙂 )
You have to know your mother. If she is the type that would be more than happy if you approach her in a nice way then go ahead. If she would get angry that you are telling her what to do, I don’t think it’s so simple. You gotta ask a third party what to do (your local rabbi???)