Truly smooth aussies are not possible as smooth coat is a dominant trait in double coated breeds so in order for any offspring to be smooth coated at least one parent must also be smooth coated and Aussies are homozygous for longcoat gene.
Ignoring any health conditions (such as allergies or mange) that may cause hair loss in any dog, my Lark is as short coated as they come. What you see in these photos is a perfect outline of her body her coat lays slick against her body only her neck and britches have any considerable fluffy right now.
Tho she will probably gain a little more coat as she ages she will never be super fluffy.