@SisterMargarettai echo all the other posters, it is beyond frustrating to hear that ED teams seem to have so little understanding of anorexia. Anorexia is really a biological illness caused by weight loss, for some that weight loss is caused by a desire to be thinner but for a lot of others it can be caused by recent physical illness, accidentally not eating enough and doing too much activity, anxiety and any other reason for a teen to lose weight.
We weren’t given a meal plan either, I designed my own based on what I knew dd liked and what I could add enough fats and calories to.
Have the principles of FBT been explained to you? Have you been signed off work (if you work) this is not a quick journey and likely to take months of feeding your dd to get her well.
Autism can work to your advantage, my dd is also neurodiverse and so once the rules and routine were established dd did stick to them.
Has your dd had her bloods and other observations checked? Her wfh is v v low so id want regular bloods to check for refeeding syndrome initially.
Have you checked your dds phone? Id be tempted to take it away at this point as the temptation for your dd to look up ways to avoid weight gain will be very high.
My dd also never verbalised what she was doing to the ED team but she did want to be thinner as she thought that would make her more popular. She absolutely would not have told the ED team that though!