That was amazing. Big Mac so eloquent, AJ so, so sad.
You know, they could totally do that as an episode idea! AJ starts getting taken for granted because she's so reliable and everypony just assumes she'll do what's needed but forgets to thank her. Then she gets upset and goes and does something crazy and everypony else has to go get her and they all make up at the end, with the lesson being on one side not to take friends for granted, and on the other side not to keep your problems cooped up and let your friends know when you're upset before it explodes into doing something crazy.
Silly fillies, it doesn't work like that. There are no alicorns. You just get a sea pony that can fly and do magic once every four generations.