Vernita Lee, chose to not meet Patricia probably because Oprah had another half-sister also named Patricia who had hurt Oprah in the past by going to the tabloids, and who had died from drug abuse.
Vernita Lee was born in 1935 in Mississippi. Shortly after Oprah's birth, she moved north to Milwaukee, Wisconsin, and young Oprah was left in the care of her maternal grandmother. At age six, Oprah left Mississippi to join her mother again in Milwaukee.
Vernita currently lives in condominium in Milwaukee purchased by Winfrey. She was in the audience for Oprah's fabulous 50th birthday party and she was in the audience for another special show.
Here's a picture of Oprah's mother Vernita Lee.