As soon as I saw this title I laughed literally out loud. Mikey does the same thing!! He's doing it because we reinforce it -by talking to him when he does it. So at the dog park he'll see another dog or person and start whining. And then I say 'go say hi' and that gives him permission and he goes to say 'hi'
However in your case if it's bothering you-totally ignore it. Don't say anything, don't look at her and don't allow her to see the person/dog until she is quiet. She'll learn
Welcome by the way!! (that's too funny, Mikey loves kids the most too!)