Season Two shows that Clementine has found an ability to effectively dodge walkers even at a moments notice.
By the time Clementine had left the New Frontier, she had become much colder and aloof towards others.
After seeing her un-dead parents, being forced to either shoot Lee or leave him to turn, and after Omid is shot and killed, Clementine loses most remnants of her childlike innocence.
Over a year later, these events have clearly changed her.
Clementine is not a conformist and is not afraid to speak her mind, believing that everyone should do their best to be a good Samaritan unless threatened otherwise.