What a cutiepie! I will tell you why the dogs are being dumped at your place. The sorry owners are "led" to your house because the dog's guardian angels know that you will take care of them
I hope your neighbor is able/willing to take this precious little one and give her a loving forever home.
I won't even start on the sorry example of a human that tied her to your fence and left. My words and thoughts on that subject aren't appropriate for writing here. All I will say is that anyone who dumps a dog should be taken into the forest and tied to a tree and left there - forever.