Mounties on Vancouver Island say they are increasingly concerned about the welfare of a missing 18-year-old after her cell phone was discovered Sunday morning.

Tyeshia Jones was last seen leaving a friend's house party in Duncan, B.C. some time around 2:30 a.m. Saturday.

Her friends say she was heading to a Real Canadian Superstore to meet a friend, but never showed up. Her cell phone was found the next day by a caretaker outside an adult learning centre.

Her mother, Faith Jim, told CTV News it's not like Jones to disappear, and she's worried for her well-being.

"This is not like her to do this. It's her first time. I just want her to come home," she said.

Searchers spent the day looking in the nearby woods and on the river bank looking for clues. Duncan RCMP Cpl. Kevin Day said there are few leads.

"She is missing and we don't have a clue at this point as to why that is. Hopefully there is someone out there who can steer us in the right direction," he said.

The teen's sister, 15-year-old Aaliyah, hopes her sister is staying with a friend but fears something worse may have happened.

"It's very painful and stressful," he said. "I just wish she would come home."

Police have searched Jones' bank and phone records, but say they have found no activity since a text message was sent at 3 a.m. Saturday indicating she was heading to Superstore on August Road.

"We're still looking further into the records from the phone companies. These things unfortunately sometimes take a little bit of time," Day said.

Jones is described as a 120-lb. First Nations woman with long black hair and braces. She was last seen wearing a black jacket, blue jeans and black boots.

Anyone with information on her whereabouts is asked to call the North Cowichan/Duncan RCMP at 250-748-5522 immediately.