First of all, 41/2 months of history could be a factor. Do you know much of her past?
Second, all dogs want to be in a dog pack, and want to know where in the hierarchy they are. It is paramount to their security. If you want to make a dog neurotic, mess with that. My husband is alpha dog, I come second and our dog is third. We consistently behave like that around her. If our dog, as a puppy, had tried to "outrank" me, my husband would have nipped that in the bud. It sounds to me like you are letting this puppy get the upper hand so she is alpha dog, guarding you from everyone else. You need to establish a workable hierarchy. If you feel lost - look over dog traning books. Best to get going soon since your puppy is older now.
Also puppies really are geared to eat, sleep, play/exercise and poop and if that doesn't get on some sort of routine, its very disconcerting to the puppy too. Listlessness can be a schedule that is way out of whack or something more serious - when is the last time she was at the vet?
Thanks for posting and good luck.
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