Just to echo everyone else, it is helpful to separate the ED from the child. My dd is lovely, helpful and compassionate. The ED was selfish, irrational and hated everyone!!!
I also added calories, it’s really important to set ground rules including that the kitchen is now off limits to your dd. She should not be wandering in when you’re preparing food.
I aimed to get around 3000 calories into dd a day for a 0.5-1kg weight gain per week. I made porridge with double cream with an added banana and nuts for breakfast (around 800 calories), high calorie snacks cakes/chocolate bars/crisps and dips etc.
I added butter and double cream to absolutely everything.
Does she exercise? If so that needs to stop.
Anorexia is really a brain based illness, similar to dementia or schizophrenia. The brain takes a massive hit when the body is in calorie deficit and can shrink by a considerable amount. This causes symptoms such as the anorexia voice (a voice in their head telling them not to eat/everyone else is trying to make them fat etc), severe anxiety, OCD, irrational beliefs (my dd thought brushing her teeth would make her fat at one point.)
The good news is with weight gain these behaviours will disappear. I don’t agree there is always an underlying psychological issue that causes anorexia, sometimes teenagers just don’t realise what’s happening until it’s too late.
Theres also an anorexia gene (it’s really similar to the schizophrenia gene which makes sense when you consider the ED voice they can hear) and the theory is this gene activates when there’s weight loss. Theres a million and one reasons why someone might lose weight but for some with the gene they will be much higher risk of developing ED.