It will probably be hard to breed them, due to two things:
1. He is a bit young. I always waited until they were over 1 year.
2. She is the alpha female, you said, and this is her house. It is best to take her to breed to someone else house. She will not be as agressive then.
I would look for an experienced male and take her to meet him for the match. Yorkie Rose is right.
Good Luck!
T.