Translation:Die größte Frau bringt den Veranstaltungskalender.
why not "die höchste Frau....."?
You wouldn't say "the highest woman" in English either.
You also wouldn't say 'the biggest', so it's a valid question.
People are "groß" and things are "hoch". "groß" can be used for things, but much like "big" in English it doesn't necessarily refer to height.