I'm pretty sure if it's happening in a GIRL's cabin, then OP is a girl. Girls can't exactly "rub one out."

Actually, the first time I heard the term, a girl was telling me she was going to do just that. Turns out, I’m pretty good at phone sex.

Except that the OP is probably much older than the 12 year old girl, so your suggestion is a form of sexual abuse....

mimimomomo, My suggestion is clearly absurd. You need to lighten up.

Lol

I tried that, the only sounds that came out were of me opening and closing my mouth. Help?

Oh, yeah, that will have a lasting effect aside from making her resent adults. Did it occur to you that if she's watching porn it COULD be because her parents aren't exactly stellar examples of humanity? If she's only watching it, then it isn't going to do her any major damage unless her life is so devoid of meaningful input from other people that she develops an addiction.

In the US, at least, it is illegal for minors to view or be in possession of pornography. By not putting a stop to this, either by confiscating the device or telling a superior or the girl's parents, OP could be opening herself and the camp to legal or liability issues, not to mention complaints from the parents of other children who might also be hearing or seeing it. And while there may be nothing necessarily harmful in the girl watching porn (it could just be innocent curiosity), aggressive or unusual preoccupation with sex/pornography at that age could be an indicator of abuse or that the child is being groomed. OP either needs to find a tactful way to talk to the girl or being this to the attention of a superior in the camp. At the very least, it is highly inappropriate.