I watched GMB too. I thought it very telling all she kept saying was she wanted time.
That's probably what's behind all this. Her hateful language towards staff have been about them not giving her time to process this (in her mind). They took her to court so started this (in her mind).
She hasn't processed finding her boy hanging. She hasn't processed that he won't recover. She has researched the shit out of his condition as she sees it as anyone would. (When my ds was diagnosed a few years ago with a neuromuscular degenerative condition I read EVERYTHING).
I thought Kate Garraway very sensitively handled the question (using her own experience of Derek and recognising the differences) when she said she herself at points had considered what she was doing for her and what was best for Derek.
I think Ms Dance is actually at the point she knows he won't wake up, but by saying he's making progress she can fight for that time she knows she needs.