If they want the clean look of a fixed wheel bicycle; coaster hubs + front brake, your mother's sorted.
As for frame sizing? just get two different sized one, a 52cm and a 56cm one, handlebar have to be a North Road one for adden comfort as well as a long stem and seatpost to adjust height.
all that left is to get a smart looking full-on mudguard and chainguard.
another importing thing is use touring tyres, rather than those city tyres.
If they want the clean look of a fixed wheel bicycle; coaster hubs + front brake, your mother's sorted.
As for frame sizing? just get two different sized one, a 52cm and a 56cm one, handlebar have to be a North Road one for adden comfort as well as a long stem and seatpost to adjust height.
all that left is to get a smart looking full-on mudguard and chainguard.
another importing thing is use touring tyres, rather than those city tyres.