Hi @ChristineBrooke
This all sounds very concerning. I am afraid your dp/dh is very much in denial about your dsd by the sound of it. My dh was as well for a very long time. My dd’s ED started by skipping lunch. Skipping lunch is apparently the number 1 factor in starting an ED. Dd was likewise anxious for at least 12 months before the onset of the ED. This is common.
As your dsd is refusing food and reducing her intake, and has visibly lost weight, you need to contact your GP and getting an urgent referral to CAMHS. When you speak to them, I would be wary of making too much about the anxiety. Unfortunately this may be put down to anxiety at losing her mum (poor love), rather than treated this as an eating disorder. Keep it factual. Tell them her intake and behaviours.
How much is your dsd eating atm? If she is eating fewer than 500 calories in a day or if she doesn’t eat for 24 hours or more, you need to be taking her to A&E for bloods, BP and pulse, potentially an ECG. Ditto if she seems unwell or if you’re concerned.
Is she feeling cold all the time btw? What are her energy levels like? An anorexic often feels amazing until they fall off a cliff and have zero energy.
We’ve just been discussing hair loss btw. This is because hair growth primarily requires protein - hair is primarily keratin. And the body prioritises feeding and repairing the vital organs. Hair is irrelevant to basic survival and the body is impressively good at keeping us alive. When a person is restricting, metabolism slows to ensure that every nutrient is used to maximum effect.
Your dsd has probably lost her appetite. This is common, the body stops sending hunger signals. It would be too painful otherwise. And as your dsd is emaciated, by the sound of it, she needs to be stopping all sport, including PE and strenuous activities, until she has been checked out. Reduce her step count as much as possible.