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Can you tell me if she was still on the IV fluids today until you picked her up.
Is she on any medication
The excessive urination is most likely due to the IV fluids. The risk with raisins is kidney failure The reason she was getting the Iv fluids was to flush the kidneys, so she is doing exactly what they wanted her to do. Lots of fluid in lots of fluid out.
I would not worry at this point. Her blood tests were good, if there was a problem there would have most likely been some indication in the blood work.
I would watch her tonight if she is still urinating this often tomorrow afternoon I would contact your vet, however I suspect you will see a change by morning
I hope this has helped ease your mind somewhat.Please reply back if you have additional questions or concerns