Poor puppy, its sad that theres really not much you can do unless the puppy gets sick. poor little thing, i would just keep sneeking it food, or maybe you could tell this friend that you are going to a fun new dog park, and invite her along, go in your car.. then drive her to a vet instead and have her ask the vet about all this. ... altho.. that might be sorta kidnapping.. but hey.. 
I hate when people believe stupid thing and when you tell them the truth, they think your over reacting. My boyfriends boss has 2 new puppies, there supposed to be purebred **** dogs, that he supposedly paid a bunch of money for, but he feeds them scraps, and keep them out in a pen away from the house.. because there not pets, there hunting dogs.. bleh.. Of course besides the fact that there kept in a pen, there not technically neglected in any.. they have food water and shelter.. but i just dont see why someone would pay so much money for a pup, then leave it outside.. -ok end mini rant- lol
I hate when people believe stupid thing and when you tell them the truth, they think your over reacting. My boyfriends boss has 2 new puppies, there supposed to be purebred **** dogs, that he supposedly paid a bunch of money for, but he feeds them scraps, and keep them out in a pen away from the house.. because there not pets, there hunting dogs.. bleh.. Of course besides the fact that there kept in a pen, there not technically neglected in any.. they have food water and shelter.. but i just dont see why someone would pay so much money for a pup, then leave it outside.. -ok end mini rant- lol