Into played so well, I thought Shasha will continue to look stoic but fall but it didn't happen, Poor Into couldn't convert despite needing just one point, But please let's not blame her or criticise her mental state, this things happen to everyone, LSW was up 10-7 or 10-8 too in the last set of the WTTC last year and Ito came back to win, FZD, XX , DN, ML and pretty much every of the best players have had the result rescinded against their favour when they were up game points or match points, even Timo ( the "mental" king),
As for her smiling, One may question if she was concentrating her fullest at that moment of all moments, but I feel that in previous days when she's beaten the top CNT, she was always smiling and smirking that way, I don't know if it's entirely a way for her to assure herself that things are under control, or a sinister psychological trick hoping the opponent looks at her and get despondent, But I think it's the former.
Still About the match point issue, they're all top players, if A can do it to B, B can do it to A too, It's the game
