UPDATE:- Ginger has now had Coxoid in her water for 7 days (including 4 days of direct oral drench on top).
Her face is still pale in colour (she has a little colour - not a great deal). I see her pecking at the layers, sunflower seeds and corn - but how much she eats - I don't know

. The only thing she eats with gusto is mealworms - which I try and keep to a small amount each day as a treat after I've given her the medication etc.
Her poop is still watery/runny and very green as before - I'll attach pictures to show you what I find in the hen house (from this morning).
She has free range but doesn't wander far - she ambles around but stays close to the fence in view of the other hens.
If it wasn't for her colouring or her poop (and the fact she hasn't really grown) - I wouldn't be too worried about re-introducing her back in with the others - especially if I thought it would be less stressful for her.
Incidentally - I spoke to the breeder about her condition (because I first saw signs within 2 weeks of her arriving here), it seems that they have experienced Coccidiosis in the past and say they treat with ACV. Suggesting that they don't actually vaccinate the hens. Is that normal with a breeder? I'm due to pick up a couple more point of lay hens in the future.
So anyhow, I digress, my question is - do I keep her separated for another week and give her half the Coxoid in the water each day and maybe continue with a direct oral drench (or not? She obviously hates this and puts up a bit of a struggle). Or do I release her back into the coop with the others? I've attached a very short video to show you how she is - this is her walking about (the hen on the outside of the pen).
Has anyone any ideas?
@Wyorp Rock - appreciate your thoughts as you have been so incredibly helpful throughout this journey.