Kia ora Robert, I'll accept 'Chestine' as it does seem to be the name she used, although we usually go by the birth name. It's important to add the other names she may have been known by to the AKA field to help out future researches so I'll update the profile.
Birth - Emma Christina Kioller (reg. 1878/382)
Marriage - Emma Chestine Kjoller (reg. 1901/5774)
Death - Emma Chestine Armistead (reg. 1943/26915)
All registration numbers noted under the timeline tab :)