Yeoman Janice Rand only appeared in eight episodes of the original Star Trek. In the show’s first season, only William Shatner and Leonard Nimoy were guaranteed to appear in every episode. There were three episodes in which she did not appear. Rand’s character was not written into two (“Mudd’s Women” and “What Are Little Girls Made Of?“) and Rand was deliberately written out of “Dagger of the Mind“. Grace Whitney said this was a creative decision made because the episode’s storyline put the mutual and yet repressed attraction between Kirk and Rand too much out in the open.
The reasons for her leaving the show vary, depending on who you choose to believe. Gene Roddenberry’s biography suggests that the character was dropped due to budget cuts, however other sources claim that she was dropped from the show because Yeoman Rand limited the romantic possibilities for Captain Kirk and still other sources will tell you that she was written out of the show because at the time Grace Lee Whitney was suffering from alcoholism and it was affecting her performance on the show.
Grace Lee Whitney alleges in her autobiography that her being removed from the show had something to do with an unnamed TV executive having made a sexual assault against her. She was sacked a few days later.
There was never really any explanation what happened to Yeoman Rand, she just disappeared and then showed up again in Star Trek The Motion Picture. It would have been nice if they had explained her absence in some way.

Spock was born on the planet Vulcan in the year 2230. His parents are the Vulcan ambassador, Sarek and a human woman named Amanda Grayson.
James Kirk was born on March 22, 2228, in 

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