Carrie Fisher... never did someone go so far on so little talent. She lucked into the biggest cinematic cultural event of the late 20th century and then mined her own addictions and idiosyncrasies and her maternal relationship to continue her career.
I guess that’s one way of looking at it. She was 20 when she got the Star Wars part. She was chosen for her type, not for her range. She never became a great actress, but she was a talented writer and monologist who did a lot with her troubles and her family’s to make herself and other laugh. Many of her problems may have been related to her being bipolar, and she did much to make that condition better known.