Aww...I'm so sorry it didn't work out
Sometimes it is so hard to know how your current dog will feel and act when you bring a new one home. Sometimes they are automatically fine with it, sometimes they take a while to get used to each other, and sometimes it never works out. I know you must have been really dissapointed and that it had to be hard on you to make this decision.
congrats to her new mommy
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.