POLICE have renewed calls for the public to be on the lookout for a teenage girl who vanished five months ago.

Fifteen-year-old Sarah Brown disappeared in February after leaving her Templestowe home.

Her mum, Natasha, has pleaded for her to return home.

She said Sarah was due to start at a new school the day before vanishing five months ago.

"I love you. Please, please come home. Please," Natasha cried.

"This just isn't Sarah. It was her birthday the other week and everything is still sitting there.

"I love her and just want her home. She's not in any trouble. I just want her home."

Natasha said the family had recently moved from NSW and Sarah was moving schools from Warrandyte High to Doncaster Secondary College.

She added Sarah was a keen ice hockey player and was "shy, timid but friendly and happy".

"All she took with her was shorts, T-shirt, jumper and that was it," Natasha said.

"She shut down her Facebook before she left."

Sarah's sister, Mellisa, said she received an email from Sarah in May.

"She just said she wasn't doing well and didn't want to speak to anyone," Mellisa said.

"She's my baby and I just want her home."

Officers have chased down a number of leads in the search for Sarah but are now calling on the public to help them out.

There have been a number of possible sightings of Sarah including at Geelong on April 20, in Werribee on April 16 and at The Pines Shopping Centre Doncaster East on May 4.

Investigators have also received tips on possible sightings of her in Box Hill, Camberwell and Cranbourne.

Police believe that Sarah is using public transport to get around and might be travelling with two other girls.

Sarah is described as caucasian, 160cm tall, of slim build, shoulder length light brown hair with bright pink tips at the end, brown eyes and a fair complexion.

Anyone with any information about Sarah's whereabouts is urged to call triple zero (000).

david.hurley@news.com.au