I checked and the still came from PS I Love You - mea culpa
I could swear she was the girl who took off her clothes in the coach's office and waits for him to come ...
I think my confusion came from Pretty Maids and PS I Love both being in the November 1971 Sex in Cinema ...:unsure:
Scheimer & CBS didn't particularly care about Joanna Cameron's nude scene in Gene Roddenberry's Pretty Maids All in Row before they cast her as um you know Andrea Thomas ... ;)
she has a very ample.... IMDB http://www.imdb.com/name/nm0441423/
Including a film recently reviewed on bluray by RAH ...
IMDB indicates that Grady had 10 episodes at that Rossane was in all 10 including the missing episode - Merry Birthday, Happy Xmas (1975) ... Laurie Marshall
http://arstechnica.com/tech-policy/2016/02/happy-birthday-is-public-domain-former-owner-warnerchapell-to-pay-14m/
They may have had difficulty getting the rights to the "mechanical" ie vocals if the performers were not available to authorize it ...