Hinch was a 23rd century Human female. By the mid-2260s, Hinch served in Starfleet as a sciences division crewperson assigned to the USS Enterprise as a nurse, under the direction of Doctor Mark Piper.
In 2265, Hinch assisted Piper in treating Lieutenant Commander Gary Mitchell in the Enterprise's sickbay after he had been struck by a poison dart on the planet Dimorus. (TOS - My Brother's Keeper novel: Enterprise)