When told that she was taking her partner to the hospital, police followed and one officer took the man into the emergency department. The other officer processed Louw for drink-driving and then asked her to accompany them to the police station.
Louw initially refused, pulling away from the constable and walking off, but she eventually complied.
A search of her handbag revealed the stun gun.
Lawyer Doug Taffs said the stun gun had been in her handbag ever since Louw arrived in New Zealand. Customs had not "batted an eyelid" when she declared it on entry to the country.
He said most women carried stun guns in South Africa and her continued use of hers was "cultural ignorance", not a crime.
Judge Raoul Neave said that Louw's actions, while unlawful, had been understandable. Neither man engaged in the Blaketown fight had been charged, but she had.
"The person who caused all this gets off scott-free, while you get left to clean up the mess," the judge said, discharging Louw without conviction.