No a match for Nebula, Thanos tricks the novice of supreme power to undo his work (the killing of half the universe) when he had the Gauntlet. She did, but also turn herself back to the shriveled old hag he'd transformed her into. How stupid is that? 🙄
Then again she was just a newbie as Thanos points out - didn't really have access to all the Gauntlet's powers. But she quickly revived her again.