Ebby Steppach last spoke to her family on October 25, 2015. After a conversation with her older brother, the then 18-year-old vanished from Little Rock.

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Her mother, Laurie, claims that law enforcement made two mistakes during the investigation into Ebby’s disappearance that could have provided much-needed clues to her daughter’s whereabouts.

WATCH: What Police Found In Missing Teen’s Car That Sent Mom Into A Panic

In the video above, Laurie claims that there was a search near a cell phone tower but the wrong phone number was used. And, hear why Laurie claims law enforcement never recovered surveillance video from a Walmart that was on the way to the park where Ebby’s abandoned car was located.

On Friday’s episode of Dr. Phil, learn what was found in Ebby’s car and why Laurie says that’s when she knew her daughter was taken. Check here to see where you can watch.

Ebby Steppach remains missing. If you have any information, please call Detective Tommy Hudson at the Little Rock Police Department at (501) 404-3128. Or, call the Little Rock tip line: (501) 371-4660 or the Halos Investigations: (662) 420-6518.

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What 18-Year-Old Told Her Brother In Last Conversation Before She Disappeared