I would be getting her on a GOOD food , and its really not good you have had for such a small time and already tried 3 types of food? thats hard on there lil tummys dont be switching it up on her like that .what was your cousin feeding her that shoulda been what you continued to feed and if you chose to switch it should be very gradual like mix a small handfull into her old food and gradually increase over WEEKS until the new food ratio is more then the old and then eventually completely the new food. sometimes it takes a few different trys to find the right food but dont switch foods fast might take a few months to find the right one , one she likes and one that has a good nutritional balance. She may need some time to adjust to a new home as well and being away from mom that young is hard on them. deworm her and just monitor the food intake she is lil and wont eat a huge amount puppys that age should be eating smaller meals more often then adults like 3 x a day. do you soak the kibbble at all? is she used to being on kibble already when you brought her home? might want to put a small amount of warm water on it and let it sit a couple minutes before you give it too her. And what are you feeding her right now? puppy food? and what size of kibble?