Hi there, I am very sorry this has happened to you. Is there anyone you can get to help you with her? It sounds like she might benefit from a bit more mental and physical stimulation to meet her needs. A nice long walk often does wonders for a young dog's brain.

Is she food or toy motivated? You can try tossing some treats or a toy she likes away from your body to redirect her attention to something more constructive. You can also try using some puzzle toys and slow feeders to keep her occupied.

Does the leash biting occur during her walks?

 

How big is she right now? Has she had any formal training yet, or are you following any kind of training program with her? Six to eighteen months is a tough age. I call it the adult body, baby brain stage.