I was reading an article on BBCMundo and came across the following sentence: "Como la más joven y la única niña en la familia, dice que siempre estuvo muy unida a su padre."
I thought that the imperfect tense was used for things like this, where if you can't pin the feeling, action, etc. down to a specific date, the imperfect is used (She always felt happy, She used to feel happy, etc., you can't pin this down to a certain point in time so it would be imperfect + it's a description of an emotional state).