Hi there,
she might be testing your boundaries or she might be insecure. If you are confident that she knows the command (which it sounds like she does) than the first option is more likely. Also the fact that she wants to bark in your face even if you turn around indicates that she is dominant.
You should not give in or change the command. Your pup is at an age where testing to see who is the real pack leader is quite common, so you want to make sure that whenever your pup tests you you re-establish your leadership status.
Be matter of fact, calm but firm. Tell her to stop barking. If she does give her a treat. If she doesn't ignore her, walk away and don't continue the session unless she calmed down. When she is quite again continue where you left it off.
Let us know how you get on.
John
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