She isn't moving. That location screams being set up specifically for FP+ only M&Gs. The fact that no one else can see/hear the character makes it a great location for any next gen "talking Minnie". You don't have the info on your band? Well, you don't know that she called the group before you by name. Relatively small queue area works well when you can regulate how many people are in line at any give time using FP+ by only allowing a set number of reservations.
If anything, I'd say they keep going further forward with specific areas for M&Gs. It is just a progression of their regimentation of the entire M&G process at WDW. Custom locations allow for interactive queues, and the appropriate size lines. Not to mention they need things to shows as "good" about NGE and FP+, having special select M&G is a good way to do it. Just like reserved parade viewing. Private spot for 200 people out of the 5k watching the parade walk by. (overlooking the plethora of other spaces you can sit in to watch)