She started vomiting last night at about 11.00pm, and was sick all night - just bile in the end. Keep giving her water but it just comes back up. This morning she seemed much better so she ate a yogurt and had some apple juice. At 1pm threw the lot back up. She's just gone to bed but I'm worried she will dehydrate at this rate. Any ideas on what I should do? She's never really been ill before, and I feel like I don't know what I'm doing.