The woman was arrested after the incident, and the 17 year old was transported to hospital via ambulance with head injuries.
The Ministry of Children and Families was also involved as there was another younger daughter in the home at the time. To ensure her safety the girl went with other family members.
The 45 year old woman has since been released from custody on a promise to appear in court at a later date.
Police are continuing to investigate to gain additional statements, and the Ministry of Children and Families is also continuing their efforts to ensure child safety.