Welcome @BloodyHellKen You've made all the right decisions so far and you're getting some food into her so mega congratulations - seriously, don't underestimate how much of a good job you're doing.
What you need to do now is make sure you're harmed to the hilt for the GP appointment - in the first post of this thread is a heap of resources - including the MARSIPAN junior scale. This is what clinicians should be using to assess the eating disorder. Use it in your discussions - ask how your DD rates on Marsipan Junior, ask what her postural drop is etc. Don't be fobbed off by a GP saying they'll weigh and review.
Do you know your DD's weight and how many calories (roughly) she's eating?
Be prepared if your DD has had a significant starvation experience to argue for admission to hospital for re-feeding. Re-feeding syndrome is when the body's systems are compromised due to starvation experience and the body needs to be supported to increase calories gently but regularly to avoid organs going haywire and sadly occasionally failing.
Don't focus too much on the 3000 calories yet - there are lots of different approaches and much will depend on your daughter's character and the nature of her food intake now. Some people are able to load up on calories with the implicit/tacit agreement of their child, others will manage to work around any fear foods and try to reintroduce these safely.
The general recovery approach is "FBT - family based therapy" which entails you as a parent taking control of meals and eating - which you're already doing. Where it differs is that each family will find their own version of "FBT"
My main advice to you though is be the squeaky wheel - ED services are stretched but they won't be any less stretched by you advocating strongly for your DD.
Do use the thread -no stupid question, no shame for when things go badly off track, lots of support and huge cheers for every success - whatever that looks like for us individually