It is her puppy enthusiasm that will win Elijah over eventually. In my experience it is harder to get two Shelties "together" when there is a larger difference in years. The first dog sees his/her territory invaded, status challenged (puppies know no boundaries- bless em for that) and he does have to establish "I am the boss here" attitude which takes snarls and turned backs and other dog put downs. I am guessing when she gets a little older, knows her place better and settles down a bit they will be best buds. And it will be so nice to have someone who understands "my" language thing going on. She is a cutie tho and she knows it.