Do not correct her for growling at the other puppies. Fear should not be handled with corrections, or it may get worse. It can also stop the growling, but not the fear and there is the danger that a dog may go directly to biting if not allowed to growl.
Distract her with something. You say she is great with "look at me"? Use that, then treat and praise her for obeying THAT command. This way, even though you are stopping the growling, you are also ignoring it.
Hopefully she will learn that having the other puppies around means fun and treats and praise and realize they aren't so bad after all.
She is VERY pretty, by the way!!