@Boundaryqueen1 I don't think some people here realize that you are feeling really brittle and close to the edge after years of fear and being abused. Finally, respite, and if you sound a little manic, seems perfectly understandable to me.
However, the respite is not a magic wand long term, and the plight of DSD will affect you all, even from a distance. So, some sort of plan...
With DSD, you are pretty much in failure to launch territory. I've got some experience of this... Behind the knife stuff, I'd guess she's actually terrified of how she is going to function in the real world. Does she bring on the knife when people try to make her see into her future, rather than living in the moment with the phone etc? Is she trying to compel you all to look after her financially and practically for ever?
Going out on a limb here... She knows how to play computer games, but does she believe she has any other useful abilities to support herself with? If she is ND, then things that are obvious and easy to most people may be mountains to climb for her, and conversely, the pig difficult for most people might be just a touch of a button in her eyes.
She's been avoidant for so long, the mountains are now Everest, rather than Mt Snowdon. For DH, moving her forward will depend on creating a very gently sloped ramp to the future. Starting with small practical tasks, and as confidence grows, increasing the slope of the ramp. She needs to learn to like herself (I suspect she loathes herself, actually). Each small success builds confidence, and building confidence helps her to like herself.