Hi mum glad the appointment went okay ish, it's so much to get your head round in the early days it can feel like you're trying to catch up and process everything all the time.
Have you had a look at the Eva Musby resources yet? She's very good at what to say/not say when you're feeding them. Lots of distractions are key and saying on repeat 'yes this is the right amount/yes you have to eat this/yes this is the right balance/you can trust me'
I wouldn't allow any negotiation at this point, you need to make the food away from your dd (she must be strictly out of the kitchen) put it in front of her and expected to eat it. I would have a food snack schedule so she doesn't get to say when she has the snack - that's your decision.
The risk of giving it too soon after a meal is the break between a meal and a snack is then too long which can intensify ED thoughts.
For example we did breakfast 8am, snack 11am, lunch 1pm, snack 3pm, dinner 5.30, evening snack 7pm.
Also a word of warning over the ED team meal plans - they are almost always not enough food, the amount of calories needed for an underweight teen to gain weight is absolutely massive. It can be up to 5000 calories a day. The only way we could do this was using butter, cream, oil etc in every meal.
If you're not already I'd strongly recommend blind weighing from the start, when the reality of weight gain starts happening it can be really traumatic. I wish I had insisted on blind weighing for my dd from day 1.
As for telling people, it's a tricky one. Anorexia thrives in secrecy and there shouldn't be any shame in having a fairly common and very serious illness. That said if she doesn't want to tell her friends yet I wouldn't push it, you may want to start telling family and friends though as hopefully you will get support and understanding (that's not guaranteed unfortunately! Lots of us have had well meaning but crass conversations with loved ones 🙁)