In a jury trial, as I understand it, it is the prosecutions job to prove the case to them beyond reasonable doubt and the defenses job to refute the prosecutors case.
Hence in Scotland the verdict, at one time, was proven or not proven. Somewhere along the line the courts there adopted the more stark English verdicts of guilty or not guilty, retaining the not proven verdict.
The adversial system of trial by jury relies on the jury reaching their verdict based on the case presented to them in court and at one time they were "boxed" until they reached a verdict no matter how long they took to reach a decision.[No fancy hotels for them in those days].
Based on the present rules the lady was certainly in contempt of court and has been punished accordingly.