Remember she's not growling...she's purring, lol.
I say this because we had a puppy that we thought was so upset but was wagging it's tail...finally figured out it was purring because that is what his friends the cats do when they are happy and getting scratched.
Now if you can convince it to use the litter box, your life will be so much easier.
She's gonna be a beaut! The trainer cat is a lovely looking furbaby too