It's happening to a handful of people and I don't know why. It seems to be the same people, so it's probably something to do with the browser they're using or a script they're running or something like that.
Also we generally don't ban people just for double posting. It happens enough we just remove one of the posts.
I can't help you with that. I don't deal with any of the admin stuff. You can try and open a support ticket under the Contact Us link at the bottom of the page
That's what I thought, but I also wouldn't put it past her to be reusing stuff years later. If it's a repost we can remove it, but I don't feel like looking through 400 posts.