From the video in the article you posted:
"Sheena put an overnight bag in her car on Friday evening. She was supposed to be right back, but when she didn't return, her sister assumed that Sheena's boyfriend had picked her up. That is, until Saturday morning, when the boyfriend called to say that he, too, was looking for her.
Sheena's oldest daughter saw her mother [Sheena] gesture to someone on Friday night, when she went outside, but because Sheena said that she'd be right back, she didn't think anything of it."