Harford County Sheriff Jeffrey R. Gahler said Thursday the woman was a temporary employee there and was from Baltimore, but he did not immediately release her name.
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He said seven people were wounded altogether. Four of the seven died, including the suspect.
A Baltimore hospital received four patients with gunshot wounds after the shooting.
Johns Hopkins Bayview Medical Center said in a statement Thursday afternoon that it was waiting to confirm that family members have been notified before sharing any additional information.
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The hospital has declined to say whether one of the patients is the suspected shooter.
A law enforcement official told The Associated Press that three people were killed in the shooting Thursday morning. Officials said the suspect was critically wounded.