She thought everyone had died; Garnet, Amethyst, Pearl, Greg, even herself... as a half human name Steven, but apparently that didn't happen, none of them even existed...yet. Yellow says it was an imagination that Pink Diamond created in her mind, but that's impossible, that couldn't be, she seen this all before as Stevonnie through Pink Diamonds eyes. It's confusing and no one can help her. (I don't own the image, belongs to TrustyArts from Deviantart.com)