15 year old daughter agin...

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Recently she's taken to flushing things. This sounds like she's acting like a little kid! What do you think I should do? We've got a robust toilet, so I'm not so concerend about clogging. So far I've just let her flush things. I figured why not, if it's fun to her, I guess I should let her go at it. I know there is still a possibility of clogs, but I'm not worried. What do you think?