(Spoilers within the game of Dragalia Lost)
Pinkie could feel the tears of loss and loneliness of someone on their special day, and she knows what must be done. It didn’t matter if she was located in a different world, as well as a different time. Even if it was only for a little while for a little smile, Pinkie would never leave someone down on their birthday!!!
P.S. If Pinkie wasn’t singing, it wouldn’t be a VA joke.