Results are sometimes off during flareups which is why doctors often prefer running tests when their patients are feeling well.
My opinion is that she should still have taken your blood though.
I’m not sure what staying off red meat and beer is supposed to accomplish. That may skew the data. And an effective gout diet would be a bit more complicated than that.
Has the level of uric acid in your blood been tested before?
If it’s never been tested, you might want to insist on getting it tested before changing your diet.
Do you already have a reliable gout diagnosis?
If you don’t, a strange test result during your flareup might be a useful clue so that might be another reason to insist on getting tested now.
If you are confident you have gout and have had uric acid tests before, you could try a more serious gout diet if your old test results suggest that dieting might be a realistic solution.