Family and friends of an Illinois woman who has been missing for nearly three weeks were planning to mark her birthday Saturday with a candlelight vigil.

Lisa Stebic, a mother of two who was going through a divorce with husband Craig Stebic at the time of her April 30 disappearance, would have been 38.

"It's difficult to be optimistic this many days out," family spokeswoman Melanie Greenberg told The Joilet Herald News. "But we can never completely lose hope."

Click here to read The Herald News' story.

The vigil will take place at 7:30 p.m. CT in Plainfield, Ill., and balloons will be released to honor Stebic's birthday, the Herald News reported.

Craig Stebic has not been named a formal suspect in the case and has been compliant with police requests, according to Michelle Sigona, a correspondent for America's Most Wanted, which has profiled the Stebics' case. Craig Stebic gave police the family's computer but would not submit to a lie-detector test on the advice of his attorney, Sigona told FOX News.

It was reported Thursday that Stebic was trying to have Craig Stebic evicted from their Plainfield, Ill., home so the family could "live in peace."

Stebic's petition for temporary eviction stated he was being "unnecessarily relentless, cruel, inconsiderate, domineering and verbally abusive," reported The Joliet Herald News. His behavior was "jeopardizing the mental well-being" of their children, she wrote.

Divorce proceedings began in December. The couple has lived in the same house since then but rarely spoke.

Craig Stebic's attorney, Dion Davi, denied the abuse allegations to the Tribune, noting the couple cited irreconcilable differences in their divorce action. He said Stebic was never in danger from her husband.

Stebic was last seen at about 6 p.m. April 30 at her Red Star Drive home in Plainfield, Ill. The mother of two worked at a local school cafeteria so she could be home in the afternoons with her kids. She disappeared while her husband was in the backyard and her two children were out.