Authorities found her body at approximately 6:30 a.m. Saturday. They did not release her cause of death.
"Due to the current investigation, we are limited on the information we are able to release," DeKalb County Sheriff Nick Welden said in a press release.
Jonie L. Barnett, the girl's mother, wrote in a Facebook post shortly after her daughter's disappearance, "Her phone was left behind and my baby takes it everywhere. Nothing in her phone indicated she was planning to leave!"
She also added that her daughter is not the type to run away.
In a social media post after authorities found her daughter's body, Barnett wrote, "Amberly life is not the same now you're no longer here, but our love for you is still strong and will remain year after year."