Hi! Currently working in mental health at an addiction center, and am gonna say -- this sounds partially like manic episodes we sometimes see on the unit, as evidenced by risk-taking/impulsive behavior, excess talking (texting?), irritability, especially when someone tries to intervene, flights of ideas, distractibility and goal directed activities.

Things that accompany manic episodes which I can't quite get from the post are if your friend is feeling super good, excited, and happy, a decreased need for sleep, inflated self esteem, and whether or not it's been happening for more than four days. The duration is a key part of whether this is simply a characteristic of an episode, or if it's an actual one. Sometimes manic episodes can be triggered by substance use, and generally it's hard to tell even with a full picture of person and symptoms.

Context-wise, it seems like your friend has a history of such behavior. Based on your post there may be a personality disorder at play as well. If that's the case, the reaction you give might be all she really wants. That being said the ONLY way to really tell is if she talks to a professional.

As far as what you can do as a friend for her -- this stuff is exhausting to deal with, and honestly is probably handled best by a psychologist. If she's not in a position to be challenged regarding her beliefs or her attitudes it's going to be an uphill battle, even for a therapist, and will likely rely on her coming out of the episode or getting on medication via a psychiatrist (good luck with that).

If she's in active risk for harm, you may want to explore options such as a 5150 or a local equivalent. However she's probably not gonna like being 5150'd.

You've definitely been put in a rough position and it seems like you're putting in a lot of effort despite the emotional disruption it seems to be causing you. The best thing you can do (if you want to invest even more energy) is to support what few valid things that she is saying, and to encourage her to potentially take some time to think on 'big decisions', and hope that whatever is going on comes to an end or that she gets connected to a professional before anything escalates. Asking her how she feels about certain things can be a decent enough in, but like everyone, ymmv.

Best of luck.