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From what @amey has written on here before his partner is an occasional commuter, but doesnt ride that regularly.
On a well fitting cargo with reasonable standover height for a shorter person i assume they'd be fine. Guessing this cargo is more baby duties than carrying 100kg of archive boxes.If only omnium made a smaller/step through frame i wouldn't see a problem, especially as the steering feels more 'normal' than a lot of other cargoes.
I had a friend probably about that height who managed on a small mini-max. Wouldn't recommend it for a none confidant cyclist tho, lack of standover height will be a real problem