I saw the original post on DragonPorn and can see in no way how DragonPorn could possibly be in the wrong on this.
DragonPorn is a review site and did what DragonPorn always does so well, took their own screenshots, reviewed the mod and posted links to the author's site, in this case Graces site. This just seems to be another one of those fragile ego (or sensibility) things I'm afraid. If you publish work to a medium such as the internet then I am guessing that as an artist you want exposure for your work. Setting boundaries on where you want your work to be reviewed is nonsensical.
If Grace received an influx of negative comments from visitors perceived to originate from DP to her site, then either comments should have been moderated or switched off, or simply just left as an open record. I can say one thing from experience though, that their are always plenty more fish in the sea, and limiting your audience is one of the fastest ways to kill a site. That audience will take a long time to grow back.
Sorry, but I think DragonPorn is blameless in this.
