Police say Estela Rios-Gonzalez, 30, was reported missing by her family in Yakima County on October 2.
Officials say she may be traveling with an ex-boyfriend named German Garcia, 40, who is wanted for questioning.
Police say the pair might be traveling in her vehicle, a grey 2002 Chevrolet Venture with Washington license plate ABR4784.
The Yakima County Sheriff's Office says says Garcia was spotted in the Boise area on October 3 and believe Rios-Gonzalez may have been in the area as well on either October 3 or 4.
Detectives believe Rios-Gonzalez is in danger and are urging anyone with information to call Crime Stoppers at 343-COPS.