DENVER -- There's still no leads in the search for a missing mother in Jefferson County and her family is fearing the worst.

Nonnie Dotson, 33, disappeared just over a week ago. On Monday, the Jefferson County Sheriff's Office took DNA samples from her mother. They say that's standard procedure, in case they need the information later.

Dotson, an Air Force nurse, told her family on Sunday, Nov. 19, that she was going to walk to a nearby shopping center at C-470 and Kipling to get a smoothie. But she never returned, leaving behind her 16-month-old daughter, Savannah.

Officials have no evidence of a crime and still call it a missing person's case. But detectives have exhausted all of their leads, including one that led to a well-known Denver hot spot, the Grizzly Rose Country Western dance club.

The club was the last public place where Dotson was seen. She was at the club the night before she vanished. Her brother said that a bar patron told him he had to help Dotson fend off two men who were flirting with her that night in the club. Some family members wonder if one of the men could have followed her home.

But Jefferson County deputies said they explored that lead and came up with nothing.

That night wasn't the first time Dotson was at the club.

"Years ago she used to come in here and dance, and I can vaguely, myself, remember her in here years ago," said club owner Bill Repola.

Repola said employees don't recall seeing the single mother in the club on Saturday, Nov. 18. But one of his customers did remember her, he said.

"There must have been something about her that stood out," Repola said.

Dotson's family is adamant that she would never abandon her baby girl, whom she use to call every few hours when others were babysitting her.

Since Dotson has been gone for a week and there's been no trace of her, her family is left to fear the worst.

"We're trying to not think about that, but that's the reality," said Dotson's mother, Candice Dotson. "Somebody knows."

"Every time the phone rings you jump. Every time somebody knocks on the door, you jump. It's a cumulative effect," said Dotson's stepfather Kevin Doyle.

Dotson was on leave from Lackland Air Force Base in San Antonio and was visiting her family when she disappeared. She was due back Nov. 21. The Air Force has not classified her as AWOL, but as "whereabouts unknown."

Deputies said that they have spent hundreds of hours on this case -- more than typical missing persons cases. Search dogs have been used to search for her but there's been little success.

If you have any information on the case, you're asked to call the Jefferson County Sheriff's tip line at 303-271-5612.