I'm not too sure about this one (I am only superficially acquainted with female INFJs IRL), but she seems I, N and J to me and not T. She also nails ethereal, sage and regal characters (LOTR, The Gift, Elizabeth, The Aviator).
Okay, Economica, I've actually seen very little of Cate Blanchett's movies or roles (they seem to be mostly "strong-chick flicks" and bio-pics). Also, I'm kind of weak on exposure to INTJs in real life.
But based almost solely on the clips and transcript you provided, I'm not seeing much real F there. Maybe just a little Fe in her studied appearance, and some mouthing of social approved (PC) F values. But every time I expect her to say something "F" (for instance, when talking about her kids), the F is just absent. She defers to the interviewer, or she brings up a positive quality that's distinctly un-F. For example, when talking about her kids, she doesn't have much to say about them until suddenly she enthusiastically brings up an incident where one of them suddenly identifies with being Australian. Not very F, in my opinion.
Also, she seems to describe her own emotions as foreign things that kind of come out of nowhere and startle her. For example, in the transcript she describes her first kiss with her husband-to-be: She didn't care for him at all beforehand and only felt something (not named) afterward. Also, when asked about her "emotions" upon hearing her name called for the Academy Award, she says she felt no emotion (and doesn't seem particularly surprised or disturbed by the lack of emotion). But when asked about the "meaning" of the award, she lights up and talks enthusiastically about how much it "means." (IOW, no F, but lots of N in her response.)
Also, when describing her husband, the first thing she says about him is that he's "fiercely intelligent" (presumably a big draw for an INTJ). Then she goes on to describe his emotional capacity and seems to indicate that she is likely to "lag behind" him on that level. She does make much of his emotional capacity, but she seems to admire it from the outside (IMO, based on the vocabulary she uses).
Meanwhile, I do believe that I see substantial Te in the clips. For example, when hit with an unexpected question, she enjoys working out the answer on the fly, and she builds logically. Also, when she has to construct an answer on the fly, the answer is likely to express little or no F (such as when she admires her son for identifying with Australia).
Meantime, there's an intensity and rigor about her that I associate with INTJs. For example, she feels that every new screen role has to be a personal challenge and a departure from all other roles that she has played. Also, her interior landscape is very potent and indescribable--she's fascinated with the topic of with how she digs deep for her motivations for characters, but she seems largely unable to describe that process. In fact, she doesn't even try. Seems very Ni--very magical and mysterious.
Back to the possibility of her being an INFJ: There are some values-oriented themes that she hits that sound kind of F-oriented. For example, she makes much of the fact that she's an actor and not a "movie star." In a separate clip not listed by you (a short clip on the Charlie Rose show), she goes on to say that she doesn't even really think of herself as being a movie actor but rather personally prefers her stage work in the theater; to her, movie acting seems fake and a cheat, whereas theater work is more real work. But again, I think that relates back to the importance of the need for her work to be a challenge rather than being an F-type value. She makes much of the need for challenge and seems to feel that she can't invest herself in a role if it's going to be too easy and won't push her to the limit.
In short, I tend to see a Te intensity behind an Fe facade. She makes Fe noises because they seem appropriate for her Hollywood persona and the stage, but she seems to have studied F from the outside--she doesn't really seems to connect on an F level when it comes to things that are deep and personal; she mainly just knows the vocabulary. Nor does she seem to attempt to stir emotion in her listeners (Fe), other than with some canned anecdotes about her childhood and upbringing. Meantime, the things that are important to her seem to be expressed in Te ways--via logical constructions, a deep-seated need for intellectual challenge, precision of expression, etc.
I took notes, so I'll be happy to discuss further if you're interested.