For 12 days, the region was held to "ransom" as public health officials and police attempted to connect the dots about the woman's journey.
Then came the news she had travelled with a companion who also had tested positive for Covid-19 but had gone into hiding.
Police eventually caught up with her at a New Lynn address, but it wasn't much comfort to Northlanders as the pair refused to co-operate with police.
Instead, officers and public health workers had to rely on CCTV footage, bank card transactions, and cellphone records to trace their movements to hotels, shops, petrol stations, and a popular coastal campsite.
Since then police have carried out a thorough investigation – that was also the subject of a legal review - into the pair's journey across the alert level 4 boundary.
A police spokesperson said they "determined that there was insufficient evidence to prove that the women obtained their Business Travel Documents by deception or that they crossed the Alert Level Border for a purpose other than what was stated on those travel documents.
"As a result, there is insufficient evidence to commence a prosecution and the matter has been filed."