Her mother tells FOX 7, she isn't giving up hope in finding her.
With every year that passes, this tree gets a little bit stronger.
"Rachel can't be here but that tree is still here and it's healthy," says Janet Cooke, mother.
This is enough hope for Janet Cooke to keep going.
"It's something tangible. She loved to climb trees; she loved the outdoors. You know, it's a good way to remember her and it's here on school property," says Cooke.
She planted the memorial tree at Georgetown High School in honor of her 19-year-old daughter Rachel, who went missing on January 10, 2002.
She had went for a morning run in the Northlake subdivision, Northwest of Georgetown.
It was between 11:00 and 11:30 a.m. that she was last seen, just two-hundred yards away from her parents' home.
"When Rachel was taken, this community was very close. It was a very small, close community and those first few weeks, thousands of people that I didn't even know...the people I worked with, the people that knew Rachel, they were all out there. It didn't matter, there were people who didn't even know her out here looking. This is some place they can come to say hello," says Cooke.
13 years later, Janet is still searching for answers.
She continues to work with detectives to find out the truth behind Rachel's disappearance.
As time goes on, she says it gets harder and harder because there is no new information.
"Keep her in your mind, because whoever did this is still out there. It's not over until it's over. I want answers and I want closure. I think the rest of the people that knew Rachel want the same," says Cooke.
Janet is hoping one day she can change the tree's plaque from missing to found.
If you have any information about Rachel's disappearance call the Williamson County Sheriff's Office at 512-943-1300 or Williamson County Crime Stoppers at 1-800-253-7867.