This was inspired by Kohakuhime of Konoha. Like the title says, it's a meme of Harry Potter!
If anything, she was just letting herself play this dream out until it was time for her to wake back up to reality.
No one was able to withstand against the Cruciatus Curse without doubling over from the pain it caused them. Why had she even bothered getting to her feet when she knew what was coming?