The alleged victim was found alive by military police on a routine patrol on Wednesday, according to the Los Angeles County Sheriff's Department.
"She's very lucky to be alive," said Capt. Eddie Hernandez with the Major Crimes Bureau of the LASD.
Stanley Alfred Lawton, 54, and Shaniya Nicole Poche-Lawton, 22, have been arrested in connection with the brutal allegations.
Authorities say the two kidnapped the victim, a woman in her 40s whose identity is not being released, drove her to Stanley Lawton's home and held her there for at least a week.
They allegedly beat her, sexually assaulted her and brought her to an ATM and forced her to withdraw money.
Officials say the suspects previously knew the victim, but the exact nature of their prior relationship was unclear.
After the MPs found the disoriented woman near a highway, law enforcement was alerted, the woman was hospitalized and treated.
"It's a vicious case," Hernandez said. "It's at gunpoint by force, that victim is then transported across state lines, held in a house inside a room for at least a week."
"At some point she was sexually assaulted, and then left for dead."
It was unclear why the suspects left her alive in the desert, he said.