It's weird to me that people would find this cute. Like, this is literally just someone with manic depression/bipolar disorder. In one morning, going from super happy about hanging out, to playing out detailed anti-fantasies about all her friends leaving her such that she's left crying... like, if I was her friend, I would absolutely just tell her, "you're a fun person, but you are way too emotionally unstable and codependent, and I can't have a relationship with you if you're always going to be like this."
To anyone who's seeing this and thinking, "man, I need me a girl like that!" Trust me, you do not. You are fetishizing emotional instability, and brother, it will be your downfall.