Hey @Shedqueen it's really hard thinking through this stuff, and I agree with @Mummyoflittledragon that you know your dd best and one size doesn't fit all.
we did take quite a tough stance on things, particularly when my dd was in the depths of this horrible illness. In my work I have some understanding of behavioural approaches, and I know the theory that 'intermittent' rewards are most powerful. This is one of the theories behind eg gambling, and it means that even if you lose 99 times out of 100, the 1 time you win is so powerful it compels you to keep going. I think this applies in the refeeding stage of anorexia, and I made sense of it as if ED gets one 'win' it will compel it to grow stronger and keep going. So I made sure that there could be as few 'wins' for ED as possible. That meant a hard line around 'life stops if you don't eat', we sat with her for hours while mouthfuls went in, and we were very concrete with what we expected, and carried it through. There was an expectation that every bit of every meal / snack was eaten, and we worked hard to eliminate discarding, eg crumbling, hiding, spitting or smearing of food in an attempt to avoid it. For a long while I would use a rubber spatula to gather up everything that had been smeared and get dd to finish that. The consistent approach of not letting ed win was the point to all of this, and it did feel pretty mean at times, but I could see when ED did get a win (prawns down the side of the sofa cushion was a memorable one!) things would be harder again for a while. My dh found this quite hard, he would often say 'she's eaten most of it, can't we just stop?' but I was adamant that we couldn't let ED win, and I do think now it was the right thing, although it felt very hard.
my dd is probably neurodivergent too, but doesn't have a pda profile so I can see how this would not be good for someone who does. For my dd having a clear, concrete and consistent set of rules is a helpful thing, things that are unexpected or ambiguous are harder.
taking a tough approach feels pretty horrible from a parent side too, there were months and months where I was a shell of myself, and spent many hours weeping. I didn't believe we would ever get out of it and I felt like this was going to be our life forever, but a pretty rigid and consistent approach did eventually start to improve things.
i was thinking of everyone on this thread last week as I was doing some diy around the house and I got round to painting over various marks on my kitchen and dining room walls made by thrown or discarded food. As I was doing it I was remembering the individual incidents and reflecting how far we have come.
so, long answer to your question, a tough approach did help us. If / when we experience relapses I'll probably try this again as a first line. But I've learned from people on this thread mainly that it doesn't work for everyone. It's hard to figure it out, because it invariably makes them much more distressed at the start, so it can feel like things are getting worse, but physical and brain recovery is a building block to more general recovery, and so I saw it as short (relatively) term pain for longer term gain.
my dd doesn't hold it against me, in fact she wrote me a letter this weekend for Mother's Day thanking me for sticking by her from day 1, and not giving up. I had made peace in my mind while things were most awful that I would take our relationship being destroyed if it meant she could recover, but it hasn't worked out like that - our relationship is much closer now.