She is described as 5ft tall, of medium build with shoulder length black hair and wears glasses.
When last seen Aubrey was wearing a black blazer with a black skirt, white trainers and had a large beige backpack.
She is known to frequent areas in South Liverpool.
Officers are asking for the public's help to locate her.
Those with information on Aubrey's whereabouts can contact Merseyside Police on 101, or message @MerPolCC on 𝕏.