With her ascension, Twilight Sparkle brought many changes to Equestria. Royal intelligence projects, organizations, research, all to pursue a more advanced and safe nation. She’d gone ahead with good intentions and brought about many good things, but the work left a severely small amount of time to spend with her friends. But, this new technological revolution left the Friendship Council with far too much work to have enough time to spend with Twilight anyway.
Starlight took on the role as the head of the Council so that Twilight could spend more time doing her duties as a Princess.
Rainbow retracted into her Wonderbolt work and traveling on missions of diplomacy.
Soon, the council started to answer more to the Royals then to the Friendship Map.
Twilight didn’t completely leave their lives, but she may as well have. She sent them birthday gifts and visited every few holidays, but was otherwise too busy to talk anyway. Eventually, she had lost the true value of Princess of Friendship.