How are you reprimanding your dog? Mouthing is quite natural behaviour in young dogs - it is how they learn about the world.
The way in which it is dealt with by the owner can dictate whether it becomes a problem or not
Direct confrontation can lead to this sort of behaviour escalating - for example, pushing her off a sofa or getting her to move when she does not want to. Many people find that a better way is to use a long line to do this so it is much less confrontational.
Are you making sure your dog has plenty of things to chew to distract her from chomping on you?
Also is she getting enough "mental" activity to keep her busy. Sorry, lots of questions. Stick around though, there are plenty of people on here who have been through the same as you and come out of the other side. The thing is to find a kind and positive way to show your dog what sort of behaviour you want from her - it is trial and error sometimes, but you will eventually find something that works for you and her
ChrissyB - I am surprised that someone who holds the views you seem to, bothered to get a cocker, or any dog for that matter
As has already been explained to you, this site promotes positive and kind training methods and not outdated, dominance based methods. If you do not agree with it, then please put your case politely and respectfully - it sounds like by "expert" you mean you!
If you have such a problem with the views of members, then perhaps COL is not the forum for you
Alternatively, you might wish to read the threads with an open mind and perhaps learn something