First of all,you have a baby there,she is going to be picky for a while untill she gets used to having her food changed as you have stated you are doing to try and get her to eat.
Im not sure if you are giving her puppy food or just tin dog food.
We have had dogs for the past 30yrs from westies..........who are very picky to GSD,'s who in my opinion are even pickier.
We are now down to only one girl,(GSD),who is coming up 11yr,she went off her food when we lost her brother last year and her auntie the year before and we had to tackle food times in a different way.
We feed her a complete twice a day with a boiled egg chopped up for both breakfast and tea,and she loves it.
When they were all puppies they had the same..........a complete lamb and rice (james wellbeloved) puppy ,still i put the egg in,also for extra calcium...........home made rice pudding.Even now..........she has left over veg (if we have some) mixed in her tea instead of the egg.There is nothing wrong with giving a LITTLE human food diced up small just to add a little variety if it gets her to eat then so be it.There are lots more things to try.....................it all depends on how much you are willing to do, always 95% dog food at least and the remainder whatever you have.If you do use a complete,unless you soak it with hot water (boiled) and leave to swell for 10mins.......only give a small amount dry as in the stomach it swells to double its amount and size and that will cause you little puppy to have major trouble. Small amounts of tinned tuna in sunflower oil is another trick.................but as she is still young......i would stick with egg/chicken/veg just as a small mixer.Good luck.