I was led to believe that the poster, posting as GGumpteenth was not Gabriella, as I too initially thought.
Another Gransnetter put me right.
However, it's not for me to say who has changed their name, but it did make me realise that it's not a good idea to speculate, it can cause all sorts of bother, when a post is attributed to the wrong poster.
Posters change user names for a variety of reasons. That's their business. However, it does cause me some unease when someone disappears, but sometimes posters withdraw for health or family reasons or they have had just enough of the nastiness on GN.