Sorry, She's Taken

Leaf, everybody's good friend, has been gone for a year in a half now. Before she left, she told everyone that she'll be back in Kanto in a month, and she promised— that did not happen.
Yellow wants to believe that Leaf just got caught up in extra training, but she knows that its not true. Leaf keeps a promise, even if it kills her. Everyone is upset, but Green most of all. What will Yellow do?