A worker at a Brooklyn discount store tried to foil a would-be shoplifter Sunday — only to get stabbed.
The 30-year-old victim, who was not identified, was working at a Family Dollar store on Flatlands Avenue in East New York around 11:48 a.m. when she was slashed by the thief, police and sources said.
She was taken to Brookdale Hospital by ambulance and was listed in stable condition…