The character of Olga Nordstrom (portrayed by Kim Richards) appeared in the episode Town Party, Country Party. Olga was unable to run around with the other children, as she was born with one leg shorter than the other. During the episode, Charles Ingalls makes Olga a special shoe, despite not having Olga’s father’s permission, enabling Olga to run around with the other children and play.
At the end of the episode, Olga and her father are happy, now that she isn’t limited by her disability.
The character of Olga does not appear again in the Little House on the Prairie TV show. She is not mentioned again either on the show, so it is believed she is still alive during the series, just not featured on the show, as Kim Richards was a one time guest star.