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We called the vet last night, their view was just to give her little bits of water at a time and monitor the situation. Didn't seem to think there were indications of anything too serious. Nauseous dogs will drink too much water and throw it up again. She's been sick again through the night, most recently with a few flecks of something else in it. She doesn't seem to be getting significantly worse but also no better, so we'll call the usual vet when it opens and see what their thoughts are.
Personally, I'd see if there's a vet with an out of hours number you can ring..