Her motivation comes from having fun.
She looks cute in bottom right on the first page.
Gyoza eating contest. So she's gonna win that one.
An eating contest is not the right contest to force someone into. You need a lot of motivation to do well there, and being forced is sort of against a lot of motivation.
Who's that guy with the huge body?
"What're we gonna do?!"
"Ignore then, I guess."
That's how you deal with trash talk. Less talk, more action.
If they fall that quickly, might as well pick China-chan instead until she loses her motivation. Or dad.
"Passes to eat and drink for free!"
That's such a cop-out prize. Give it to the ones least likely to want to eat anything at all.