I do remember reading about it here, but I never went back and looked for what she allegedly wrote. But I thought about that post while I was watching last night. Ellie seemed happy for the people who advanced, hugging Jeffery and Braiden, and immediately applauding and smiling for Korin, even though she knew it meant she was out. I think it's unfair to focus on a few seconds of her being heartbroken and call her a sore loser without taking the rest of her behavior last night (including hugging Regina and Viktor when the camera was no longer focused on them) into account.
I'd have preferred Ellie to go through, but I can't argue with choosing Korin over her. I like them both and hope Korin gets a song better suited to her. Adia was a tough ask.