I know what the puppy food is for, just not the "large breed" part. don't really care either. she seems to enjoy it. Once a week (after we do scent training sesh's) if she's good she gets chicken and rice for dinner. man she really goes crazy for that stuff.
large breed is less nutrient dense so that the pups grow slower because growing too fast can cause joint problems in larger dogs. some brands also have stuff that is supposed to help with joint health, but afaik no one really knows if they work or not.
no offense, but your pup actually looks very slightly on the tubby side, so less nutrient dense food is probably a good idea even if liblib thinks she's small.