“I think the the right to reply to your review is the only right you should have. At least you can defend your corner.”
I agree with you to a point, and right to reply should be that, a public reply then that's it, no more comments.
But running a review site, you do get genuinely unfair reviews and businesses trying to nobble each other, we see it all the time. So it's a fine wire act, and takes good moderation to weave through the complexities of reviews that turn nasty.
Luckily we have the advantage of being able to invoke alternate review resolution for large trade bodies if one of our Trading Standards Institute approved listings kicks off, in which case we hand over to an ombundsman. But for the others it can be a minefield and I'm all for negative reviews going live, and we let most go through that have made it past our profanity filter!
We all make mistakes from time to time, and a decent right to reply can actually draw sympathy, letting the visitor make their own mind up. Assuming it's not all negative reviews 
But can't believe the hassle Trena has had to put up with, and then resort to court action. At least she will get her day in court and be very interested to hear the outcome.