It is clear that in the first chapter Daisy is presented as a somewhat vain, fun-loving woman who is aware of her own charms. Note how Daisy and Jordan are first described in this Chapter:
The only completely stationary object in the room was an enormous couch on which two young women were buoyed up as though upon an anchored balloon. They were both in white, and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house.
Clearly this shows that Daisy is very aware of the effect of her appearance and the impact of artifice on others, especially men. Note how she is also presented as something of a flirt, very aware of how her mannerisms attract men to her:
She laughed again, as if she said something very witty, and held my hand for a moment, looking up into my face, promising that there was no one in the world she so much wanted to see. That was a way she had. She hinted in a murmur that the surname of the balancing girl was Baker. (I've heard it said that Daisy's murmur was only to make people lean toward her; an irrelevant criticism that made it no less charming.)
Daisy, then, in her actions, is very flirtatious, having mastered the art of making men feel special and drawing them in close to her through her murmurs.
Therefore, from this first introduction to Daisy, it is hard to ignore the fact that she is a woman who is very aware of her beauty and also knows how to use her charms to lead men on - which of course sets the stage for the rest of the novel.