Good for you for recognizing you have a problem while Minnie is still so young. You are right - she is being bossy and you must stop it before her behavior gets worse.
I'd suggest trying the Nothing in Life is Free program. You are in charge of the resources (food, toys, bed, etc.) and she needs to learn that.
Here is some good information about the program:
Nothing in Life is Free Nothing in Life is Free Training Method Using Nothing In Life Is Free To Become The Alpha*Dog — The Dog Dude