An excellent (and unusual) example is WITHNESS FOR THE PROSECUTION
(1957).  In that work, Christine (Marlene Dietrich) is willing to do what
is needed to get what she wants, moral or immoral. With regards to
contemporary sources, there may be a possibility with the later films of
James Cameron.  Although he is often dismissed as an action filmmaker, he
does deal with strong women in an extremly unconventional way.  Some of
the situations in THE ABYSS, ALIENS, TERMINATOR or TRUE LIES may suit the
criteria needed for your research.
Please update me (and the group) on how your research in this area is coming.
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