Remember, too, that pups this age have very small tummies and it doesn't take much for them to get filled up. As long as she is eating a little bit throughout the day, and drinking as well, she should be just fine. I certainly wouldn't be switching her food around, if she eats what you are giving her now, stick with it! Make sure she has lots of chew toys or else she WILL end up chewing things you don't want chewed. Congrats on your new pup!