Not condoning her actions at all. The scene is pure lunacy.
But…people act crazy at sporting events.
I’ve gone to a couple NBA games in the past few years, all in the cheaper seats. It’s hilarious watching the people in floor seats, seats that cost hundreds or even thousands of dollars, during timeouts. The dance/entertainment crews come out and throw little plastic/foam balls into the crowd. People go after them like they’re the winning Powerball ticket. Things they wouldn’t pay $1 for in any other circumstance.
There appears to be a trait common to many/most in those situations that the idea of “winning” something completely overtakes any rational thought about what having a baseball (or tee shirt, or whatever cheap giveaway item) from a random regular season game means (almost always, little to nothing outside of an anecdote).