Ms Smith alleges her sister attacked her about 2am after they had spent the night discussing "issues". The dog joined in and Ms Smith estimates it attacked her for 20 minutes before police arrived.
She suspects a neighbour heard the noise and called for help.
Ms Smith said the dog tore at her scalp, ears, nose and lips. She was taken to Tauranga Hospital and has undergone surgery.
"It was not going to stop," she said. "I don't know how I'm going to get it out of my head when I go to sleep at night.
"I'm very lucky to have survived this."
Ms Smith wanted to speak out about the attack so the public knew "these dogs don't stop".
Ms Smith was discharged from Tauranga Hospital on Monday afternoon.
In court, Ms Smith's sister faced a charge of wounding with intent to cause grievous bodily harm.
She was remanded on bail without plea and is due back in court on June 3.
Community magistrate Robyn Paterson granted Bayley bail subject to conditions including a ban on consuming alcohol and non-prescribed drugs and entering licensed premises, except supermarkets.
Mrs Paterson also banned Bayley from having control of any dog.
Bayley is also barred from having any contact with her sister and entering Kawerau township.
