Estelle is a very outspoken person and gives her opinion about every subject. she loves parties and crowds. she also constantly worries that something bad is going to happen to the people she knows. according to the five-factor model of personality, estelle would score

according to the five-factor model of personality, estelle would score:  high on extraversion and high on neuroticism

on the five-factor model of personality, people are considered as an extrovert if they love interracting with people and became the center of attention (we can see that Estelle is outspoken and lover parties & crowds)
And people will be considered as a neurotic if they're cautious and take everything seriously (which cause Estelle to constantly worry)