Suzanne Morphew went missing on Sunday, May 10.
CNN  — 

A 49-year-old Colorado woman who went cycling on Mother’s Day hasn’t been seen since, according to the Chaffee County Sheriff’s Office.

Suzanne Morphew, 49, vanished Sunday after going cycling in the area of County Road 225 and West Highway 50 near Maysville, Colorado.

Nearly 90 investigators have spent days looking for her using drones, scent dogs and flyover missions.

On Thursday, they found what could be her personal item, Chaffee County Sheriff’s Office said Friday in a statement. It did not say what the item was or where it was found.

“While investigators aren’t releasing details about what may have been found, they can confirm that Ms. Morphew has not yet been located to date,” the sheriff’s office said.

Local, state and federal investigators are searching steep and rugged terrain in an effort to find any additional items, authorities said.

A Facebook page has been set up to find Morphew, and Morphew’s husband Barry has pledged $100,000 for information that leads to her safe return. That reward has been increased to $200,000 thanks to a matching donation from a friend.

The FBI has set up a dedicated tip line at 719-312-7530 for any leads.

CNN’s Allen Kim contributed to this report