Not all show type have heavy feathering around their legs, I do not think that is much to go by. Head shapes are quiet different too and the ears on the working type are set a lot higher
Your girl looks to be a show type. Well bred or not, does it really matter, she is gorgeous.
The working type and the show type are the same breed, they can be mated together and still produce pedigree Cocker Spaniel puppies that can be registered with the Kennel Club.
As suggested have a good look at the pedigree and follow the lines back looking for "Sh Ch " or FTCH, this will give you a better idea what lines are used in her breeding.