Synia Johnson was last seen in the 6200 block of South Artesian Avenue, according to a missing person alert from Chicago police.
She is 5-foot-5, 150 pounds and has brown eyes and brown hair, police said.
In each incident, two males wearing ski masks and black jackets entered businesses and demanded money.
Police are looking for a 15-year-old girl missing from Chicago Lawn since November.
The incidents happened in November and December, Chicago police said.
Four people have been shot dead and nine wounded in gun violence across Chicago since Friday night.
The 31-year-old man was walking with his son about 8:40 a.m. in the 6200 block of South Mozart Avenue when another man approached him on foot and fired shots, Chicago police said.
A 34-year-old woman missing from Chicago Lawn on the South Side has been found safe.
A 14-year-old boy has been reported missing from Chicago Lawn on the Southwest Side, and he may with with a missing 14-year-old girl.
Five people were injured Thursday after someone crashed a stolen SUV in Chicago Lawn on the Southwest Side.
Firefighters struck out a fire that spread to three buildings Friday in Chicago Lawn on the South Side.