"If another large aftershock occurs it can re-energise the system."
So far the quake has over 1200 felt reports.
The quake struck on Thursday morning.
The room she was in didn't have anything to drop, cover and hold under.
The quake had a magnitude of 5.6, reports Geonet.
The quake hit just after 5am.
The quake, centred 10km north-west of Culverden, struck at 4.28am.
More than 1500 people reported feeling it.