Police are reviewing surveillance videotape of a bar in Madison, Wis., where a 22-year-old college student was reportedly spotted before she vanished more than a week ago.

Kelly Nolan is a fighter and "the rock of the family," her younger sister April told FOXNews.com on Monday.

Nolan disappeared after she separated from three friends in the downtown area of Madison.

April Nolan, 20, talked on the phone with her sister early Saturday morning, June 23. That appears to have been the last time anyone heard from Kelly.

"She's a wonderful, fun-spirited and happy young woman," April Nolan said. "But she's one of the strongest people I know. She's the rock in the family and if she's put in a hard situation I know she is going to be tough."

April Nolan told FOXNews.com that she and Kelly spent all of Friday, June 22, together and split up around 5 p.m. in front of Kelly's apartment in the downtown area. Kelly Nolan then went out with three very good friends of the same age, she said.

Kelly Nolan separated from her friends at around 11:30 p.m., according to Joel DeSpain, a spokesman for the Madison Police Department, and she hasn't been seen since.

A Madison Police Department press release said that they had located several people who were in the downtown area and had contact with Kelly the night she disappeared. These people are providing detectives with new information, according to the press release.

DeSpain said the student, who is 5-foot 6-inches, 125 pounds and has brown eyes and brown hair, was last seen wearing a green, sleeveless, scoop-neck shirt and blue jeans. She was wearing sandals with a heel and may have been carrying a handbag.

April Nolan said she either saw or talked with her sister every day leading up to her disappearance.

"There is no explanation for what happened," she said. "I really have no idea what happened. It's not in Kelly's character to disappear."

The Capital Times reported that Kelly Nolan was spotted at State Street Brats, a popular bar in the downtown area, hours before she vanished, and that police were analyzing surveillance tape to get an idea of when she might have left and whether she was alone.

Click here to read the Times' story

Matt Goetsch, general manager at the bar, told FOXNews.com he had seen parts of the surveillance video and that "... Based on the parts I've reviewed, I certainly didn't see anything significant."

Goetsch said he did not see Nolan, although he acknowledged he did not view the entire video.

There are 30 surveillance cameras in the restaurant, according to Goetsch. But the cameras are geared toward tracking liquor and cash-handling behind the counter and do not place much emphasis on what happens in other parts of the restaurant.

Goetsch said there are a few cameras that concentrate on the crowd and that may have spotted Nolan, but none of what was taped that night can now be viewed. He said the cameras save the video for five days before the software overwrites it with new video. He said he did not know of any way that police could get the images from that night.

The Times also reported that Kelly Nolan was spotted earlier Friday at a local swimming pier on the campus of the University of Wisconsin-Madison.

She was fired from her job at the Orpheum, a bar and local theater, two days before her disappearance. Family members said she went to a job interview in Madison on the morning before she vanished.

The Nolan family has been meeting with police almost every day for briefings on the case. The family has also been handing out flyers in the Madison area.

"It's been consuming every hour of every day," April Nolan said, admitting that she really doesn't know what to think of her sister's disappearance.

Their mother has vowed not to give up searching for her daughter.

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

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

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

The Madison Police Department and the Wisconsin Clearing House for Missing & Exploited Children and Adults sent Kelly Nolan's photo and information to the National Center for Missing and Exploited Children Friday afternoon.

Nolan, originally from Waunakee, had recently bought an apartment and moved to Madison from Whitewater, where she attended the University of Wisconsin-Whitewater.

“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 has investigated area lakes, and so far nothing of significance has been found, DeSpain said.

The Associated Press contributed to this story.