She doesn't need a lot of exercise yet, she's still too little for too many walks.

She's teething, her gums are probably driving her crazy. Discourage her from getting to used to chewing on you, always give her something else to chew instead if she starts .
Distracting her will help her forget the habit. Make sure you have plenty of chew toys, ragga type toys .

I have a cocker too, and they do grow out of it if you are consistent, but teething can take a little while.

__________________