In Winter Dreams, what motivates Judy Jones to get in her boat and approach Dexter? What do you think of her due to this interaction?

As the story progresses, one realizes that Judy Jones is primarily motivated by her desire to accumulate admirers who can deliver the validation she seeks.
In approaching Dexter, Judy is motivated by her overwhelming desire to acquire his attention and subsequent adulation. Despite her habit of serial dating, however, Judy never quite gains the sense of contentment she craves.
According to the text, Dexter swims out to the farthest raft on the lake at the golf club. There, he stretches out on the canvas of the springboard.
Before long, Judy races up to his location in her motor-boat. Upon seeing him, she asks, "Who's that?" However, one gets the idea that she already knows the identity of the man she's speaking to. After Dexter confirms his identity, Judy boldly asks him to drive the motor-boat so that she can enjoy riding the surf-board behind it.
Judy also tells Dexter that a man is waiting for her at her summer home on the Island. She coyly relates that she came out on the lake after he complimented her on being his "ideal" woman. Judy's words suggest that she's bored by men who worship her. Yet, male attention feeds her ego immensely.
During their time together, Judy orders Dexter to drive as fast as the boat will go. Her behavior and inclinations show that she's motivated primarily by intense experiences that feed her deep need for excitement and self-validation.