Reddit mentions of The Mirror World of Melody Black

If she's having depression and mania why are you saying schizoaffective disorder? That would be bipolar. If she only saw the doctor once they probably didn't have chance to properly give her a diagnosis...

This is a tough one. Hearing voices in and of itself isn't necessarily a problem, but doctors often don't see it like that. There's a big move in the UK to change the automatic medication of people with voices as many people who experience voices have found the treatment worse than the experience (this is an example of someone talking about that problem https://www.ted.com/talks/eleanor_longden_the_voices_in_my_head) You must keep in mind that the major anti-psychotics are well known for having some horrible side effects and a lot of people hate/resist taking them.

If she's experiencing mania rather than delusion/hallucination etc. you need to be aware that mania often feels great to the person experiencing it. It can feel amazing and people don't want it taken away from them. Trying to tackle someone during a manic episode can be extremely difficult and counter-productive.

Having said that, if she's no longer functioning and is a risk to herself that does become a problem. Rather than suggesting she goes to a doctor it might be worth finding out about support groups nearby. Talking to other people with lived experience may be more useful all round. I volunteer for the UK based charity Rethink Mental Illness (https://www.rethink.org) which might give you some ideas of what to look for.

If someone believes that they're functioning fine and that the doctors are against them it's no good just trying to get them to seek help. They won't if they don't believe they need it and trying to pressure them can turn you into 'one of them'. You say she recognises that there are some things wrong -that's good. Personally I'd approach this by building on that. What does she think is wrong? What does she think might make it easier? How can you help? Just because the situation looks awful to you doesn't mean she's experiencing it like that. You need to be careful of imposing on her rather than supporting her (a difficult balance to strike).

You also need to remember that you're her friend not her carer. Be careful you don't take on more than you can handle. If her family are around engage with them. This is going to take time to unpick so don't rush because it scares you. Take your time, listen to her and be respectful.

It might sound odd but there are two novels you might want to read. They relate to schizophrenia and bipolar and give a useful perspective on what the person is experiencing:

The Shock of The Fall by Nathan Filer
https://smile.amazon.co.uk/Shock-Fall-Nathan-Filer/dp/000749145X/ref=sr_1_1?crid=JZYX26JL2EDS&keywords=the+shock+of+the+fall&qid=1567418680&s=gateway&sprefix=the+shock+o%2Caps%2C148&sr=8-1

The Mirror World of Melody Black by Gavin Extence
https://smile.amazon.co.uk/Mirror-World-Melody-Black/dp/1444765930/ref=sr_1_1?keywords=melody+black&qid=1567418726&s=gateway&sr=8-1

IMO The Shock of the Fall is a better book but they're both really insightful.

I hope all that helps!