When Diana was HRH The Princess of Wales, she curtsied only to monarchs (or former monarchs and consorts such as the Queen Mother and King Constantine of Greece). I don't remember ever seeing her curtsying to another prince or princess. The rules changed fairly recently as to which HRH's curtsy to each other when their husbands aren't present, certainly within the last 20 years.
The lady to whom Diana was curtsying, who curtsied back, is the wife of the King of Malaysia, whose title was Queen. Malaysia has an interesting monarchical system, which rotates between the Sultans. Here's a wiki on her:
I don't know why she would have curtsied to Diana, though, as her rank, as Queen, was higher. Perhaps it was nervousness on her part.
BTW here's a new-to-me picture from that banquet:
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