She wasn't a household name, like Robin Williams or Lauren Bacall, but to several generations of sci-fi fans she was...
...the smiling woman who ominously-intoned "Room for one more, honey." in the nightmares of a hysterical woman in the classic Twilight Zone ep "Twenty-Two".
...an innocent woman caught in a battle inside a deserted building between a time-traveler from the future and aliens determined to kill him and destroy the secret that would save humanity in the equally-classic Outer Limits episode "Demon with a Glass Hand"...
...and, most memorably, T'Pring, the Bride of Spock in the (I hate to use the word, but it does apply) classic Star Trek ep "Amok Time"!
Besides appearances on other genre shows like Man from U.N.C.L.E., Wild Wild West, and Battlestar Galactica, she also appeared in comedies, Westerns, and crime shows, and was still working on-and-off in movies and tv until her passing.