Hi @SwattyPie am really sorry you're having a tough time at the moment. As you know leaving her alone isn't really leaving her alone, its leaving her with the ED who will relish that. It is a battle minute by minute.
Its really hard at this point because you may not be able to offer a convincing different future - "A recovered you will have all the options in the world" - she/ED will counter "not if I'm fat". You could go with (and we did) "We know its so hard but keep going, ultimately the ED is not your friend and the ED wants you dead" Her answer "I want that"
My advice would be at this point not to engage much in future creation right now - it will come. (there was a moment when we sensed that DD was nearing the point of considering recovery when she started talking about wanting to go on holiday with her friends) But perhaps focus on distraction and creating space away from the ED. I've banged on about it on previous threads but one of the best pieces of advice CAMHS gave us was filling DD's day. Every evening we'd plan out the next day in 30 minute slots
8:00 Breakfast
8:30 Banagrams (distraction using mind and hands to avoid self harming and ED thoughts)
9:00 Cleaning kitchen (she found this therapeutic - we weren't turning life with and ED into a slavery situation 😉)
9:30 Cleaning kitchen
10:00 Go for short walk
10:30 Board game (to distract from what was coming at 11:00)
11:00 snack. etc etc
We were helped (and hindered) in that it was lockdown but this level of planning seemed to help DD both proactively (no surprises) but also knowing we were trying to squeeze out the ED from every possible minute...