She shouldn't be allowed to run free until she figures this out and right now she is too young. Get an ex-pen or confine her to a room where she is part of the action. Make her pad available to her, if she uses it do cartwheels and give her a treat. (if she makes a mistake do nothing...except clean up the mess)
good luck
you can get a small harness at petsmart.
http://www.petsmart.com/global/produ...=1140904114819