Liviam, I don't want to alarm you, but if I were you, I would take her back.

She sounds to me like he is getting very, very dehydrated.

If she is no better by tomorrow morning, definitely take her back and agitate until they admit you and rehydrate her. Does our nearest hospital have a proper paediatric ward? If not, how far away is the nearest hospital that does? Because I have to be honest, if you presented to me with your history, I would have either put in an IV or put down an NG tube and started rehydrating her by now.

Don't be afraid to take her in overnight if you need to, either.