Your probably thinking of her small role of moon base officer one in Airplane 2.
Dr. Peter Venkman: NOBODY steps on a church in my town.

I also recall seeing some production/promotional stills of Sandahl (seated behind the control board as pilot of the USS Reliant and in a promotional group pose along with Ricardo Montalban and others)as one of Khan's followers in Star Trek II: The Wrath Of Khan. She does not, however, appear to be in the movie at all. I've looked at every scene with Khan and his merry band featured on the bridge of the Reliant, just to see if Sandahl was relegated to poviding nothing more than beautiful background scenery but sadly she's not even there.
Anyone know if she was originally supposed to be cast in the movie and had a change of mind or scheduling conflict before shooting actually started?

Thanks so much for any help.

I'm a bit of a Sandahl Bergman fan and I read somewhere that she starred in a film entitled 'The Longest Shadow' which also features Joe Estevez amongst others. As there was no date or details anywhere it seems impossible to find out. Hope maybe this helps