Elizabeth was last seen at a home in Keilor Park on Wednesday 2 September about 9:45pm.
Police are concerned about Elizabeth’s welfare due to her age.
Elizabeth is described as Caucasian, about 169cm tall, with an average build, and has brown hair.
She was last seen wearing a black Adidas top with white stripes, grey tracksuit pants, blue runners and was carrying a black backpack.
It is believed she may frequent St Albans, Essendon and Cranbourne areas.
Anyone who sees Elizabeth is urged to contact Keilor Downs Police Station on (03) 9365 3333.