In my opinion...Yes. She seems to have found her place there,alongside the alternate mane 6 where she is finally happy and accepted by others as well as herself...although there are others factors to consider like how about her family in Equestria? What if human Sunset appears? Will she be able to gain closure with Princess Celestia?...etc. and those are the times that I prefer her going back. HOWEVER, that's what fanfictions are for right?