The mother of a missing 22-year-old college student vowed not to give up searching for her daughter, who vanished a week ago while out with a group of friends.

"We're going to find you, Kelly," Mary Jane Nolan told family and friends gathered for a candlelight vigil for Kelly Nolan. "We're going to be back the way we were before, as a family."

Nolan was with a group of friends in downtown Madison last Friday night, but left the group around 11:30 p.m., said Joel DeSpain, public relations officer for the Madison Police Department.

Nolan's younger sister said the two women had a phone conversation early Saturday morning, and that was the last anyone had heard from her, DeSpain said.

The family knew something was wrong when she didn’t call, he said, adding that the sisters rarely went a day without talking on the phone.

Nolan, originally from Waunakee, had recently bought an apartment and moved to Madison from Whitewater, where she went to school.

Family members said Nolan also went to a job interview in Madison on the morning before she disappeared.

“The case is still being considered a missing person case as far as I know,” DeSpain said. "However, we haven’t ruled anything out. The evidence does not suggest that a crime has been committed.”

Madison Police said they were doing everything possible to gather leads in the case. Photos of Nolan were handed out around the community, which generated a lot of tips, police said.

“Patrols have been keeping an eye out and officers have walked the shores of Lake Mendota looking for any evidence,” DeSpain said.

The Dane County Dive Team also has investigated area lakes and so far nothing of significance has been found, DeSpain said.

The Nolan family officially reported Kelly missing on June 24, after more than 24 hours without any contact with her.

The Wisconsin State Journal reported Nolan’s mother saying her daughter had not experienced any emotional turmoil in the days leading up to her disappearance.

DeSpain said Nolan was last seen wearing a green, sleeveless, scoop-neck shirt and blue jeans the night she disappeared. She also may have been carrying a handbag.

Megan Janeway, a senior at the University of Wisconsin-Madison and friend of Nolan’s, said the two used to work together at a local club. Janeway said she was helping to find Nolan by handing out flyers and creating a page for Nolan on the social networking Web site Facebook.com.

The Associated Press contributed to this story.