Talk:My Little Pony Equestria Girls: Forgotten Friendship/@comment-5288784-20180219175018/@comment-5288784-20180219182448

The stone was able to erase all of Sunset's memory of the human world as well as everybody else's good memories of Sunset (so a lot of stuff from the end of EG1 and later). That leads me to believe that it has no "time limit" on what can be erased.

Perhaps they all used to remember her, but after she found the stone and started erasing anything that had any bad stuff in it, what little was left in others' mind was considered as not important and then it naturally got reshuffled to the regions where you have to think hard to recall the information.

You are right about others not paying much attention to her, but she was partially responsible for it. She unwillingly made herself a background student. Canterlot High is presented as a tiny school (possibly to make things simplier), but anyone who went to one that had hundreds of students knows that you pretty much only remember your class plus some standing out individuals from other classes. The rest is just a background.