Sabrina Scharf, according to one of those excruciatingly detailed Star Trek plot explanation websites.
Running a Google search on her does not reveal much. She turned up in guest roles in a number of television shows of the late 1960s and early '70s, as well as appearing in three "biker" films - including Easy Rider. The last filmography notation was from 1975, so she evidently got out of show business.
Oh, yes... before becoming an actress, she was a Playboy Bunny at the New York City Playboy Club. I reckon that's where she was "discovered". ;-P
There's a website out there collecting interviews from a number of "Drive-In B-Movie Starlets of the 1960s". They have her name on the "no interview yet, but stay tuned" list, so she must still be alive and kicking.
Okay, enough fun. Back to discussion of Newtonian physics and speculations on how best to boot that big sucker off of the Plane of the Ecliptic. :-)