So she wants to keep her dog happy, but doesn't care if her dog gets sick? I don't know about most, but when your sick your probably not that happy!
Maybe it is better if she finds a new home for this puppy. I hate to see dogs getting rehomed, but sometimes it is for the best, and it sounds like this girl only wants a small dog to show off, like the dog is some accessory. This poor puppy needs a loving mommy and/or daddy to take care of him.
Also wanted to add, I've had friends too who wanted and purchased dogs w/o knowing a whole lot. Some have become really good mommies to their dogs, others, well they can be better. I know it sucks when you try so hard to educate someone, and they refuse to listen. Like Patty said, just vent here to us! Were here for you and totally understand.