When she does that take control, let her know your the boss! Heres what you can do. (My vet told me this when my dog snaped at my other dog) Ok push her so she is laying on her side. Then put your hand on her neck holding it down. (Not to tight..but firmly. This will not choke her.) Hold her neck down untill she stops. While doing this, tell her "Bad girl! I'm the boss!". In a nice firm voice. When she calms down tell her "Good Girl!", and Release her neck! Good luck! It stopped my dog, and i hope it does the same for you!