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Hello. Thanks for the question.
It sounds like the diabetes is not well controlled yet. That is why you are still seeing excessive urination. When the glucose is over 180, it exceeds the renal (kidney) threshold. It will then spill out into the urine. When there is glucose in the urine, it's a heavy molecule. It will pull water with it. This leads to excessive urine production, and reflex increased thirst.
What you need to do, is find out where her glucose levels run over a 12 hour period in between insulin injections. This is called a glucose curve. It can be done at a vet hospital or at home by checking a blood glucose every 2-4 hours over this period. You can purchase a glucometer and check his levels at home between insulin injections. I like my range to be 100-200. If we're going too high, then the insulin dose needs to be raised. If it's going too low, then it needs to be lowered. Without this curve, you can't determine how well the dose is working. It's very common for dogs to take months to fine tune the insulin dose.
The diabetes pills just don't work in dogs. They're really not of any help here. I know the situation is not ideal, but there are good vets in Spain where you can get this condition controlled better.
I hope this helps, let me know if you have any other questions.