Ahem. she probably growled at you because you haven't given her a name yet!
I'm kidding!
I practice NILIF on all my dogs/puppies. I think that's a very good start.
This may not be a popular opinion, but I'm also a believer in scruffing along with a nice loud Ack, a sound like the dam would make while correcting a puppy. I think our pups are still young enough for this.
But first I would call/email Ali and get her opinions.
Good luck with her!