Introverted Sensing (Si): Gwen has great respect for the traditions of Camelot; she is resistant to the idea of falling in love with Arthur, or becoming his queen, at first because it goes against all the major mythologies of the period. Up until she gets to know Arthur on a personal level, she judges him based on their previous interactions and her observations of his selfish behavior. Gwen feels the most comfortable when things are predictable and she does not mind keeping to a routine. Such things as the Knights of Camelot captivate her imagination, and she is surprised if their behavior deviates from what she sees as “appropriate.”
Extroverted Feeling (Fe): She has a warm and approachable nature, inclined toward serving others at her own expense. Gwen is conscious of her place and social expectations as a servant, and is uncomfortable in stepping out of them to become queen. She is willing to put aside her own feelings and walk away from the man she loves, so that it will not cause unwanted friction between Uther and Arthur. She sometimes complains when others are inconsiderate, and is easily moved by emotional appeals. She is very good at sensing others’ emotions and getting them to open up to her.
Introverted Thinking (Ti): Where Arthur is inclined to rush in without thinking, Gwen is more analytical and hesitant. She is rational and makes strong arguments to support her conclusions. She studies other people and is often accurate in guessing their motivations. In a crisis, she remains calm and is able to creatively and logically think her way around problems that seem insurmountable. She is often a voice of common sense, to Merlin and to Arthur as well.
Extroverted Intuition (Ne): She is cautious and somewhat suspicious of other people; Gwen attentively watches the people around her and can sense when more is going on than is first apparent. She sometimes challenges and doubts loyalties, hinting at her desire to protect the people she loves from unforeseen consequences. She is somewhat resistant to too much change all at once, and does not like to take big risks, because she cannot foresee the outcome.
Note: Retyped to an introvert; I think she has more Ti than Ne.