@Roberta,
It's definitely infection, but there may be complication I don't really understand re the vulva being very infected, visible immediately - while the urinary tract infection showed up after bacteria and white cells were looked for in the relatively clear urine (which was, after all, quite dilute, so it could look clear visually). She told me we would look into that after the antibiotics course, which goes for fourteen days.
I don't think it's going to be diabetes as the blood sugar wasn't very much over normal. It sounded ruled out. Liver ruled out.
I'm trying to measure the water she gets again today, and I may have been exaggerating that she is drinking much less - but that may just be today. My impression is that it is somewhat less since she started the antibiotics.
I think I should start measuring the 24 hour water every day to get a line on it.
No spills today so far, but the day is still young.