How the... I will restrain from using bad language here but how the hell does your mother know you are on newgrounds, I mean my parents don't worry about anything I do on the internet because they trust me and sure as hell I don't get scammed anything else that is dangerous on the internet.
If she is looking through your posts that means she is suspicious of what you might and can do on the internet, this means she doesn't trust you. Get her to trust you more, show her that the users aren't drug dealers. Why would we on a gaming/movie site.