The heroine has a correct outlook on life and is not disabled. Like every student who has not entered society, she has beautiful but unrealistic fantasies about life. Before the age of eighteen, she lived a normal ordinary life.
Then she wore it.
For Gryffindor, she is not upright enough; for Hufflepuff, she is not forbearing enough; for Ravenclaw, she is unwilling to hide from the world; for Slytherin, she is not tactful enough.
Please remember these two words - drama!