Gwen replaced the luck she had siphoned, giving more to Adrien than Hector, before going after Chiron. 
Gwen usually didn't participate in the games, it was kind of unfair, or at least other people perceived it to be unfair as she could literally manipulate the outcome. 
"Chiron!" Gwen called as she caught up to him. 
"I was wondering if I could participate in tonight's game?" Gwen asked, "Some of my younger siblings have been wanting to so I figure there's no harm. I just wanting your opinion on the matter."