By Audrina Bigos

CHICAGO (CBS) — A female body was found in an Illinois forest preserve Monday, the FBI confirmed Tuesday. Authorities confirmed it is the body of missing Gary woman Sidne-Nichole Buchanan.

Her family is already mourning her loss on Facebook and believes her body is the one found at the Thornton-Lansing Road Nature Preserve in Cook County near the Indiana border.

“I’m hurt. I’m devastated,” said Buchanan’s neighbor Ella Hardaway. “She was a beautiful person. She still is a beautiful person. I’ve been knowing her since I first moved out here eight years ago, and she didn’t bother anybody. She kept to herself.”

Last week the FBI offered a reward for information about Buchanan, who is believed to have been kidnapped.

Buchanan, 27, was last seen at a concert in Tinley Park and was reported missing on July 27, according to the FBI Indianapolis field office.

“Our investigation has revealed that Sidne was last seen in Illinois but we have evidence that she was in Indiana after that. The presumption is she was taken across state lines against her will until we find evidence to the contrary,” FBI Supervisory Special Agent Mike Peasley said Saturday.

No one is in custody, and the investigation is ongoing.