I don't know if this is true or not but I'v heard that since kids are so unpredictable dogs don't know what they are going to do, so they snap, growl, bark, etc.. at them.
You know how they say dogs can sense danger or a dangerous person, we'll with kids they can't because kids don't know what they will do themselves, lol, that makes dogs are leary of them.
Maybe that is what happened it's not your babies fault, she just couldn't get a sense of what the child was going to do, afterall she was barking at her
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Candee, Bear, Daizy (in spirit, R.I.P) and Pepsi's mommy