Sudostic means to be eager to do something.
1. Stella was eager to win. Amara could see how sudostic she was to win 1st place. Here, instead of repeating the term 'eager' again, 'sudostic' has been used. And sudostic is just a synonym of eager.
2. Matt was eager to see his favourite team winning the match. But Ron was more sudostic to see his favourite team win the match. Again, instead of eager repeating twice, the second time it was replaced to sudostic. Which is another word of eager.