My guess is Rachel Ward.

And this was so tricky because Sigourney Weaver played Queen Isabella in 1992 and Judy Davis played a prostitute in 1981, both having played with Bryan Brown in a film.
Queen of Spain - Christopher Columbus, the Discovery
Sexy Widow - After Dark, My Sweet
Wife of Adv. Exec. - How to Get Ahead in Advertising
Missing girlfriend - Against All Odds
Prostitute - Sharky's Machine