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I think there are some nice smaller Nomos:
https://nomos-glashuette.com/en/minimatik/minimatik-midnight-blue-1205
https://nomos-glashuette.com/en/club/club-campus-708
The TAG Heuer Aquaracer has a few smaller models in some quite nice colours, quartz and auto:
A former colleague of mine had a white dial quartz one and she really loved it.
There's also the new Tudor BB31:
https://www.tudorwatch.com/en/watches/black-bay-31-36-39-41/m79600-0003
A smaller Rolex Oyster Perpetual like the 31 might also be easier to get hold of than some of the other models, though it depends on the dial - the brightly coloured ones are still in high demand.
Which way do her tastes lean? Classic, casual, lux, sporty, minimal…?