She operated a daycare from her home and was a dedicated member of the local church community.
After her husband's death, Gibbs was supported by the local church community. She later donated some of her husband's life insurance money to the church.Eight months after the death of Gibbs's husband, she poisoned her youngest son, 13-year-old Marvin. He died on August 29, 1966. He was assumed to have inherited a liver disease from his father, but his death certificate listed hepatitis. Gibbs was not suspected of any wrongdoing, and she again donated a large portion of her life insurance payout to the local church.