Still wonder though why she abruptly left acting. To be honest, I did not think that she was that talented. However, whenever I see her, she brings back a flood of memories. She was I think John Boy's girlfriend.

Her bio on IMDB says

"Unfortunately, for reasons that are seemingly unknown, Sian quit show biz, and has now gone on to live a more private life. Sian is the older sister of flash fiction author, editor and teacher Meg Pokrass. She has married and had a daughter, who has now apparently graduated college. She now lives in Southern California."

I remember her in a very good first season Rockford Files, as a missing girl in with the wrong crowd.

Every time I watch Lovely but Lethal I always think she looks slightly too wholesome to be a heavy smoker - somehow the smoking seems more unlikely than being mixed up in industrial espionage and blackmail...