Hi @Nutfield48
My daughter went through similar to your daughter and it's a very difficult situation that we can feel helpless to do anything about when they won't help themselves. But you are right - it can't go on like that for your daughter as the longer it does the more she will avoid any responsibility and life resulting in her becoming more unstable. So we need to address our feelings of helplessness by taking back some control as a parent. Sometimes when all else has failed tough love is needed with boundaries put in place in the home for the benefits of
Time to perhaps pull the plug on the TV and greatly reduce her time on video games regardless how she protests or tries to manipulate with emotional blackmail. As giving in is not going to address her mental issues or helping her to get better. She has to earn this leisure time by doing more productive things during the day including seeking help for herself professionally. And keep a firm stand. I did this with my daughter as well as giving her no money for games, outings or others things she wanted - she soon got the idea if she wanted things she had to earn it. And then she sought out employment.
She still has issues but her mental health is improving at age 22 and she works full time. Amazingly she worked two weeks after being scheduled when 19 within her limitations (not full time). But enough to keep her foot in the door and gain experience. This work ethic has given her purpose and independence and helped her self esteem somewhat, which is essential for better mental health.
I would encourage you to ring Mental Heath Carers support Australia to seek further advise on ways to help your daughter to seek help and become motivated and for support for you. Feel for you as I know how hard this is.