A 24-year-old Yakima woman reported missing Monday has been found alive, the Yakima County Sheriff’s Office said.

Sydney Karn was last seen Monday afternoon, when she swam across the Naches River off State Route 410 at about milepost 113. Karn’s wet clothes were found on the other side of the river without any sign of her, according to a sheriff’s office news release. She was believed to be suffering from mental illness that significantly changed her behavior over the past few weeks, a release said.

After an all-day search, she was spotted Wednesday on the mountainside as the sun began to set. She came to rescuers and was brought safely across the river. She was taken to Virginia Mason Memorial for treatment and evaluation and didn’t appear to have any significant physical injuries, the Sheriff’s Office said.