It is possible that she has edited her post to cover up the issue, but there is another thread where it is being discussed. Basically, she and some unnamed friends took it upon themselves to rate down a popular post for the express purpose of preventing that user from attaining a higher rating which they did not feel he "deserved" because he hadn't been on the forum as long as they had.
The original post in that thread has 2 negative ratings, and a host of up ratings. Averaged out, it comes to 4.45, which is pretty good given the number of 3's it was also scored.
If there was talk of a conspiracy, it seemingly didn't take hold, nor have any great effect.
The reason everyone gets a say is so that your say counters someone who says theirs for off reasons.