I could see the possibility of Case being SLE;
She's way too sensual and grounded in the real world to be an intuitive N type.
She and the people that know her describe her as "tough," usually a manifestation of Se not Si. She does come off like a self-confident person that will push herself to meet her goals. For example, pushing aside her hunger to satisfy the diet she's on, going out with friends even though she finds it pointless, making sure she budgets her money correctly etc. Si types usually just do what they want to help their internal states reach homeostasis
She's very image focused; she appears "Cool and Hip" (wears backwards hat, plans out and knows what looks good) and knows exactly how she's coming across to her audience, to her followers on instagram, and to the random people she meets on the streets. She dolls up with make-up even when she doesn't want to because she knows how it affects her image. She likes Marilyn Monroe because of the image she represents. You can tell she carries herself with a sense of pride almost like a celebrity.
She's materialistic. She likes brand name things and the finer things in life. She gets things because they are fashionable/cool/helps her image, not because it helps her internal state of comfort or anything.
She's very aware of her surroundings; watching/observing drunk people, seeing how beautiful the sky is, noticing people looking at her while she's eating, etc - she does this all while she's talking to the camera. This is because she's using Se to absorb /take in sensory info from the environment. This is different from when a type goes into Si-reflecting mode, they are usually more oblivious to their surroundings/environment.
She's gotten into trouble in the past; getting suspended from school twice (probz due to Se volition). I agree she doesn't really assert herself to others in the video, but come on, she's talking to the camera what do you expect lol
Finally, she often thinks about the deeper meaning/purpose behind the things that she does. Interested in the mysteries of space/Universe (possibly manifestation of Ni-seeking) (Could also be related to Se - being denied to explore the world) She also expresses dislike for seemingly pointless endeavors - IMO SLE wants to find that one grand purpose