How To Deal With Someone Who Is Going Through Psychosis?

[Karzonian]

Girl I know actually believes that Elon Musk is sending her subliminal messages to go rob banks. (She isn't actually doing it. She goes all disguised and puts her card into the ATM thinking that he gains access to the servers). Ay their local hangout place, she said he wrote in neon lights on the windows 'thank you for helping'. I was with them a few days ago and she genuinely believes every little coincidence she sees is Elon pranking her or something.

Furthermore, she has grown distant over the last two months. I thought she was just going through depression but after having seen her, I saw it was something worse. When speaking to her, she says that she has never been happier. Even though she has left her job, stopped going to the gym and doesn't leave her house anymore. I know she always used to think quite highly of me, now it's as if I don't matter. Is that part of the psychosis?

[emmie]

could be, she should be referred to a GP for assessment and then a mental health team for support. I have been there and it's an almost impossible thing to deal with if she doesn't get help.

[Old_Geezer]

You refer to a "girl" rather than a "woman". If she is that young perhaps you could warn her parents ?

[chanel5]

Coping with a person suffering from psychosis is extremely difficult, and what seems to work in your favour on any given day may not work at all the next day.
There is conflicting advice on dealing with the delusions of another person and I would not want to even try to offer any suggestions as to how you might address that.
I hope that I would try to be consistent in my approach to your friend. Even if she has grown distant, maintain the same level of support and friendship that you have always offered to her. Eventually, she will respond and appreciate that you are still there to support her, because many others who originally purported to be her friends will not be there - many will have disappeared over the horizon at the first hint of mental illness. Such is life.
Be consistent, give her support, remember if she ignores you, belittles you, abuses you, it may be the illness talking.
Forgive her, and wait.
It is very hard to separate which behaviours are down to her illness and which are the real person.
Eventually it will become clear, but you have to be patient.
Best wishes, you clearly care about your friend, and I hope you can find your way through this difficulty.