Cmdr. Janice Rothganger said the robbery happened around 8 p.m. at a home in the 3000 block of Angelique Street.
The victim was home alone when she walked into the living room and saw the man standing there with a handgun and a bandana covering his face.
The man allegedly demanded the woman's purse. When she gave it to him, he left the home without harming her.
Cmdr. Rothganger said the man is someone the victim had been acquainted with, so she was able to provide a detailed description.
Officers are following up on leads as the investigation continues.