A nine-year-old girl from Benbrook, Texas was allegedly kidnapped by her 24-year-old uncle and has been missing since Friday, police said early Tuesday. Caitlyn Elizabeth Williams had planned to spend the weekend with a nearby friend and was supposed to return Sunday, but never arrived at her friend's home. Benbrook police issued an Amber Alert early Tuesday, according to CBS News.

“Somebody has that baby and they need to give her back,” said her great-grandmother, Linda Bullard. “She’s somewhere, got to be somewhere. We need her home.”

Her uncle, Jessie Nicholas Williams, was last seen on Saturday in Benbrook with Caitlyn at a hotel and at a beauty salon. His SUV was taken to the police station early Tuesday morning. “We believe that she may be in danger because the family has not been able to contact the uncle,” said Sandy Eubanks with the Benbrook Police Department on Tuesday morning.

It was not immediately clear why Caitlyn's parents waited until Monday to report the disappearance. They have not been named as suspects, but authorities said they will be questioned.

"Jessie, if you're watching this you need to bring Caitlyn home," Bullard told NBC News. "You know she needs to be home right now, we are worried about her and she needs to be in school with her friends."

She left her home riding a pink, purple and white bike. “She is very adventurous,” explained Bullard. “She rides her bike around the neighborhood with her friends and she normally goes right where she says she’s going.”

Caitlyn is 4 feet 4 inches tall and weighs 95 pounds. She has brown, long wavy hair. She was last seen wearing a yellow T-shirt with a Benbrook Field Day logo, jeans, and pink and black sneakers. Her appearance might have been changed, police said. “We have reason to believe that her hair may have been cut short to alter her appearance,” Eubanks said.

Jessie Nicholas Williams is a white male. He is five-feet, 10-inches tall and weighs roughly 200 lbs. He has black hair and brown eyes. He does not have a history of mental illness, police said.