I absolutely agree with what everyone else has said. Children are very "open", and there is always a possibility of encountering something they are not equipped to handle.
My nephew has had an aversion to cemetaries for several years (he's almost six). While putting flowers on family graves, he became VERY upset a few years ago, pointing and talking to a "little boy" the rest of us couldn't see. Sure enough, there was a child buried in the direction he indicated and he was not old enough to read the tombstone. On other occasions, just driving by cemetaries, he has claimed to see people the rest of us could not. If something like visiting a family cemetary during daylight hours could upset a child, imagine the trauma one might go through while on an actual ghost hunt. Just not a smart thing to do.
Trin, the same question went through my mind. If the woman in the case was responsible and just had an interest in ghost hunting herself, she did get a raw deal. However, if she was bringing the kiddies along and putting their emotional and personal safety into jeopardy, I don't blame the judge.