Hi Peggy, I echo what lots has said your dd sounds very unwell and needs urgent medical attention.
I would actually suggest taking her to a&e today, she needs urgent bloods, an ecg and a refeeding plan as she will be high risk of refeeding syndrome.
Under 80% wfh generally means complete bedrest so you need to pull her out of school and exercise needs to stop immediately.
You need to start preparing for FBT (family based treatment) which is where you take full control of all her meals and snacks which need to total at least 3000 calories a day.
If you're on FB I would suggest looking at joining the EDSUK page as they have lots of useful guides and resources to get you started.
It is normal for you to minimise how ill she is and will be completely normal for your dd to be on complete denial about it.
Your dds behaviour will massively nosedive once you start taking control but you will learn to separate your dd from the ED which is currently holding her hostage.
I'd also suggest taking her phone off her especially if she's using any calorie counting apps. It will not be helping ar all.
Don't waste time feeling guilty, we've all been there. I encouraged my dd to start running at the start of this journey 🤯
Take control today though, do not not wait as every day she restricts will make recovery that bit longer.