Growing up, she was obsessed with comparing her body and face with KPop idols. Daydreamed of becoming one herself or marrying one and becoming fabulously wealthy. I remember at one point she said she was a princess and we had to treat her like one and I laughed because I knew she 100% meant it and it was the most ridiculous thing I’d ever heard her say.
P.S.
The pwBPD in my life shares that sort of thinking, which shows some narcissistic traits (on top of BPD). I used to call it her "magical" thinking. Granted, she's pretty, and that's a wonderful gift. However, given her disordered BPD and narcissistic thinking, she believed she'd be "discovered" as a top model or top online influencer, and she dreamed of living a Carrie Bradshaw lifestyle. She seemed entitled to it, as if she expected others to make her wildest dreams come true, for example by setting her up in a luxe apartment and paying for her travel abroad. Thus she set herself up to be continuously disappointed. The disappointment quickly turned to anger, even rage, directed at others who failed to make these dreams come true for her. Most of all, she refused to take responsibility for herself. This looks like blaming others for ruining her life. She's constantly mad that she doesn't get what she wants. Now she wants plastic surgeries to change her physical features, and she has asked her dad to pay for them. At one point it sounded like she expected him to pay as compensation for making her look the way she did. And the irony is, I think she's beautiful, she shouldn't change a thing, and even if she did, she still wouldn't be a model, not even close. She doesn't have the personality(!), and she's far too old, short and heavy (in model terms) anyway. Plus she couldn't handle the lifestyle, with all the rejection, critiques and stressful routines. She seems oblivious to the actual work that famous people do. It's the classic black-and-white thinking, where she idealizes the Princess life while disparaging the lives of "normal" people. Does that ring any bells?
The narcissim manifests in some beguiling ways. One example is during a job search. The pwBPD in my life seems to think that certain jobs are beneath her. She doesn't want to start at the bottom; she wants to skip a few rungs and get paid a lot, and yet she doesn't want a "stressful" job, either. Her resume lists more aspirations and exaggerated roles than actual accomplishments and credentials. In some regards she lied outright on her resume (for example saying she was a candidate for an advanced degree without having taken any classes yet, let alone be accepted into a program). But I suspect that in her mind, if she wants something, it's the truth? Or maybe she thinks, everyone lies on their resume, and she should, too? Her online profile lists "moving to New York," but she hasn't done anything to move to New York yet. Does this sound like your Sis? I think it's the magical, narcissistic thinking coming through. There's some identity confusion as well.