agreed. puppies, border collie's or not need guidence.. they need training and her being only 13wks she is not gonna behave just like that, all puppies muck up from time to time, its just a part of them being young, you just have to show them right from wrong. a puppy crate is a great idea, when she's bad, such as the nipping, put her in there. but you have to give her time, when you teach childen, they're not gonna learn just like that, it takes time.