(KRON) -- The California Highway Patrol has issued a Silver Alert for a missing 73-year-old woman last seen Monday morning in Vallejo.

Isabell Banach is described by authorities as 5 feet 5 inches tall and 200 pounds. She has blue eyes and white hair and was last seen wearing a yellow night gown.

Banach was last seen on Capitol and Sacramento streets in Vallejo at around 10:15 a.m. on Monday. CHP believes she is on foot.

If seen, CHP said to call 911.

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