I haven't seen her posts, Jane10, but I feel sure that I would never confuse her name with yours. I do completely understand your concerns, but I wonder if she chose the name without being aware of your username? It's possible.
I doubt GNHQ have the resources to 'hand filter' usernames. I agree Baggs, and I have no knowledge of software programming, algorithms and so on, so I've always presumed there's no way to stop these similarities. However, Gillybob has posted upthread that it is quite easy to have software that 'forbids new names with too many (digits) similarities to one already in use.' I do think this should be done as several people have been upset recently by near identical usernames.