Hey Steven,
You are correct. She'll need a little more work on the barking before incorporating the quiet.
That being said, your initial rep of quiet was exactly what you need to do, so I have no concerns about your ability to teach Luna this behavior.
I think you'll be able to work the quiet in a matter of a week, or two at most.
For now, just beef up her barking as much as possible. When it is at a desirable level for you, introduce the quiet.
Again, I'm not concerned in the least.
Thanks!
Mark