its a no no to smacking her mate, at the end of the day she's a pup thats what pups do, other dogs are more exciting than you, make your self more exciting play with her give her tip bits she will grow out of it, my collie x whippet x grey x bull is still like a pup and she is 2 years old now, but when it comes down to lamping or going out for a mouch she just switches into hunting mode and other dogs don't mean shit to her.