Firstly, I am so sorry your dog growled at you. That is a terrible feeling.
Next, I have a question. Is there
any way that Zoey might possibly be hurt somehow? If a dog is in physical discomfort they are more likey to lash out or act out of character. For example, when Will picked Turkey up after she had been hit by a car, she bit him on the face. Totally out of character, but she was hurt. I know that's an extreme example, but it just came to mind.
I don't think that your dog growling at you one time means that she is an aggressive dog. Sounds to me like this is the perfect opportunity for you to really start learning more about dog behavior, and start applying real leadership to Zoey. Being a Malamute, she is going to be tougher at times than other breeds might be.
Another thought is that if you grabbed her in an angry way, she might have felt threatened by you. I'm not sure what kind of energy you had when you grabbed her collar. It's interesting, a very similar thing happened to me years ago with a Siberian Husky I had. She had gotten in the house when she wan't supposed to, and I grabbed her collar while I was in an angry state. She bit me!!! I was stunned, and I just put her outside. I thought about it a lot. She never bit me again, and I never had a problem with her being an "aggressive" dog. It just started me on my journey to fully understand dogs and their behavior. Uhh... I'm still trying to figure them out 13 years later!!!!!!!