TuffRiderLadies Starter Front Zip Paddock Boots

Are these made solely for riding/farm or can they also be worn for general occasions (I live in a city, work in a restaurant)?

The website refers to sizes 75, 85, etc. Does this mean size 7 1/2, 8 1/2 etc??

My daughter where's a youth size 4...what size boot does she need

Are the soles smooth or do they have tread?