Been wanting to see someone frame it like that. I've been thinking along similar lines.
I watched the meme by Carpedonktum (sp?) and I think before the president walked into the room, there was a small bit of excitement by reporters.....I think Greta thought they were coming over to speak with her. Then she caught sight of the president coming in and knew she was definitely on the back burner. She was pretty miffed, and disappointed. I have to keep in mind that she is being used, and all this fame must be intoxicating to her.