You have to be very careful syringing water since they can aspirate.
It may be better to offer her food as a wet mash so she gets more fluids and you can give her a small treat of something watery like Watermelon.
Also isolating them sometimes they don't seem to drink well. Sometimes I think it's because of using a different container. Mine love to drink out a chick waterer if I separate them - it's a bit odd, but you can try that. Raise it off the floor so it's easier to get to.
It may be better to offer her food as a wet mash so she gets more fluids and you can give her a small treat of something watery like Watermelon.
Also isolating them sometimes they don't seem to drink well. Sometimes I think it's because of using a different container. Mine love to drink out a chick waterer if I separate them - it's a bit odd, but you can try that. Raise it off the floor so it's easier to get to.