It sounds to me like the dog was trying to play and was just excited.
I have no idea what the dog was trying to do, it's not my dog, mine was calmly obeying my commands. Regardless of what it was "trying" to do, I'm going to stop a 60+lb dog (which is more than double what my daughter weighs) from jumping on her in any way I can because though the intent may not be malicious, the end results may very well be.
In my opinion if your dog is off leash, on a public street, without a collar and without the owner present, you're not giving it many chances.