I won't speak to Barnaby's detective work, but he uncovered quite a few holes in things she said. Like how she was the middle child but then in a different post she had two older sisters. Then how in one post she lost her hearing at age 5 then another one claimed it was at 12.
After this was pointed out, I also realized she claimed she was now teaching English classes in Ontario, and had a BA and MA, which is a Bachelor of Arts and Master of Arts, but I remember from an earlier post she claimed how she was attending the faculty of Science. And I should know as I asked her questions about it privately, since Judy wanted to possibly persue forensic science.
I also did some investigative work too. The Stumbldore account was originally SilverMoose, and posted heavily on the main forums and in the Coyotes, but went inactive in late 2020. Then a year and a half later, the handle changed to Stumbledore, and there was a lot of posting made here on the Jets boards.
Finally, the poster known as Inanna joined 5 months later. And Stumbledore claimed to have seen Inanna in real life.
My guess is the same person or people operated both accounts. Likely the SilverMoose account was compromised from a data leak and someone tried an old password and got in.
As to why, probably financially motivated, either trying to silently collect personal information to compromise banking or credit card, or hoping to catfish someone into something embarrassing, and blackmail people.
This is all speculation, mind you, but I find it interesting that neither account has posted since Barnaby's excellent observations.