Looking at your baby, I think that getting any kind of electrolytes into her very soon would be helpful. Not sure what’s in the U.K. I use half strength Gatorade (half water) or pedialyte. I’d keep everything warm for her, including the liquids that you are trying to get into her. Your pharmacy should have some type of liquid baby vitamin, but you need to pick one without iron. Getting her to drink herself by dipping her beak into the dish of lukewarm liquid would be best. You may need to dip then back off a minute and see if she gets the idea. If she won’t drink soon, I’d use an eye dropper or some such. I’d try drops on the beak first, then if she still isn’t drinking, open the mouth and put a drop in. You need to go very slow or she can inhale it into her lung. Can you take a pic of her umbilicus, where the yolk sac was?