Diekan, you are one sick monkey. Poor Benny LOL

Ok, so, update:
Bro came over today and we talked. She, incidentally, did not want to come inside (muhwhahaha), so she remained out in the car while he and I conversed.
He confronted her about the matter, and explained to her how he "found the posts", and advised her to a) pack her bags and get out, b) get ready for a separation, or c) give him a reason to not kick her out right then and there.
(a and b, he really can't do right this moment, but we're working on that)
Now, so you understand, I was the one who orginally spotted the posts, pointed out to him what was going on, and showed him (*sigh* ...and I really, really didn't want to... but if it were me, I would want him to show me). He is, however, purposely keeping her unaware that I had anything to do with any of this for a few reasons... and I now have a few more usernames.

There's a lot more going on that will, hopefully, ensure his coming through all of this alright.
Oh and btw, he would additionally like to me to express his incredible amusement and gratitude for what you guys have done - he was impressed.

She has made no mention to him in any shape or form that people are bad-mouthing her and being mean to her on teh intrawebz. She is keeping quiet about the whole thing, thus far. We will see what transpires from here on out. He is pretty convinced that she has no idea that I am the "so-called" family member... if that's true, she's got even less brains than I gave her credit for before.
Now then, regarding his confronting her: she has crumbled before him, again, as usual, apologizing, apologizing, etc etc, and says it will stop here and now, and that she will never, ever, ever do anything like this again... right, so... she may not post again after this last time, but I am going to keep watching, just in case she decides she's going to use another username or something.
I know she reads it still. She is way, way too sensitive to shit online to not continue reading, hoping someone will stick up for her and play the sympathy card.
In the event that she does not post again, which would really be a shame, I just want to thank all of you for what you've done.
Mad love <3 to you all.
Oh, and should anything happen to surface of reasonable worth, I will be sure to add updates to this thread. The end will be very, very ugly... and not just because she'll be there.