Some of her more "insufferable" traits --the overactive imagination, the compulsion to meddle in others' lives-- could indeed be an escape valve from the reality of her otherwise highly privileged life: she has, since childhood, taken on the responsibility of dealing with her father. This is obviously a responsiblity that colors not only her present life, but which will affect her future, as well (I can't see her going to live in London with a husband, like Isabella did, not that there's anything bad about that).