Lieutenant Hackworth was a female Human Starfleet officer during the Dominion War.
In 2375, she was serving at Starfleet Headquarters when she saw that DP-7 wasn't responding to subspace signals. She was still there several minutes later when the Breen attacked San Francisco and leveled headquarters. Presumably, she was killed in the attack. (ST - Tales of the Dominion War short story: "Eleven Hours Out")