SUNLAND (CBSLA.com) — A mother is searching for answers after her daughter was last seen nearly one year ago and has expanded efforts to find her.

“The unknowing is the most horrible part,” explained Rosalie Blum, who says she can’t rest until she knows what happened to her 44-year-old daughter, Kimberly Ann Blum.

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Blum says the last time she saw Kimberly was on June 5th at her sister’s house in La Crescenta getting ready for her niece’s graduation party.

Blum says they soon noticed Kimberly had left and security footage from the home showed her walking to her car.

“She hadn’t contacted me or her sister so I went to the authorities,” she said.

The family’s concern and frustration grew after finding out there had been no activity on Kimberly’s cellphone or bank accounts.

“It’s like there’s this sadness sitting on your shoulder,” Blum said.

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A few days after Kimberly disappeared, a maintenance worker found a small bag containing old medication bottles belonging to Kimberly in the Angeles National Forest. But even after multiple helicopter searches over the mountains, there was still no sign of Kimberly or her car.

“I would like her to be found somehow, some way,” Blum said.

The family is offering a $5,000 reward for leads as to Kimberly’s whereabouts and are asking the public to be on the lookout for her or her silver 2004 Honda CRV.

Blum says Kimberly ran her own business helping people organize their spaces and had a lot of things to look forward to.

“I keep searching because as a mother there’s always a part of you that you don’t want to lose your child,” she said.

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Anyone with information on Kimberly’s whereabouts was asked to contact the LAPD’s Missing Persons Unit Detective C. Carlton at (213) 996-1800 or dial 1-877-LAPD-24-7 (877-527-3247) during non-business hours or on weekends.