13-year-old Marylee Humke has been missing since 2:30 a.m. Sunday.
Red Bluff Police believe she might be headed out of state with a much older man she met through a cell phone app.
She isn't believed to have any money or a cell phone in her possession.
"I love you and I don't blame you for anything that could've happened. Whatever has happened to you, whatever you've done, it doesn't matter," said Marylee's mother, Elizabeth Walden as she fought back tears Monday afternoon.
Clutching the hand of her husband, Walden described her daughter.
"She's very loving, but that might actually be working against her in this case because she's so caring I could see her falling prey to a predator."
Marylee is believed to be communicating with a man only described as thin and in his mid-20s or early 30s.
Police said the two communicated on the cell phone app Kik, which is a messaging system.
Walden believes they have been talking without her knowledge for the past year.
Her seventh-grade daughter loves to draw, spend time in nature and play with children, but she has also battled depression.
"We've been able to talk about it openly -- at least I thought," Walden explained.
Marylee's friends said she has talked about taking off, perhaps starting over and potentially changing her appearance.
This past weekend would be her first time meeting the man thought to be from Tennessee.
She was last seen Sunday on Marjie Avenue in Red Bluff.
She had apparently been hanging out with some friends, but her friends said she left and was picked up by a man named "Randy".
"We're using everything we've got at this point," said Sergeant Kevin Busekist of the Red Bluff Police Department.
He said his team is working around the clock with others from the FBI, Department of Justice and law enforcement in Tennessee.
Marylee's phone is also being analyzed.
However, their investigation has some paralyzing problems.
They have no license plate number or vehicle description to go off.
But despite the lack of evidence Walden is being proactive, constantly monitoring a "Marylee Missing" Facebook page and even looking at possible travel routes to Tennessee.
Walden said she hopes everything Marylee is doing is by her choice and she's safe and while she waits she has a message for parents.
"Teach your kids that secrets hurt, secrets can kill."
Anyone with information is asked to call the Red Bluff Police Department at 530-527-3131.