That's very stressful @Astrid4 chronically so, and there's so many creeps out there and dangerous situations she could get herself in. And if she starts experimenting with hard drugs the chance of recovery diminishes, and impulse control during times of high emotion gets harder for the patient to deal with without drugs or alcohol if this is a habit that sets in over years. Hopefully she doesn't get involved with people that take her down this path and are an unhealthy influence on her.
Long and slow is the same style of race most people with complex MI have to live. It really is a marathon with lots of trip and falls. Nothing changes overnight because they are not 'mental' illnesses, they are biological illnesses you can't see.
I've been on both sides of MI and I know how powerless and hard it is to be a carer. It also comes with lots of feelings of rejection because your loved one isn't engaged, their illness has taken them off line and they can't connect with people.
I hope her treatment isn't too far away.
It's hard to know if she lacks insight, or if its the total opposite and she is defensive because she knows she has got something and can't deal. MI still comes with a lot of shame, she's only 17 and she just wants to be normal. But its best to jump on this the younger she is, it comes with more hope while her brain/body still has some agility left. Corny