dominant hen

[Lisalu]

I just got two 10 year old conures about 2 weeks ago. They are seed birds, but I'm not giving up. I keep putting fresh food out for them. They have a nest box. I was told they successfully had one clutch. The female really bosses the male around. He is a small blue masked variety, and she is a peach face. She keeps him in the nest box and squawks at him if he comes out. I was reading that they shouldn't have a nest box unless I am trying to mate them, so during the last two days, I have closed access to the box during the day, but I let them snuggle at night for warmth.
My hope is to get them both socialized, so they enjoy humans. They seem to watch us, when we are sitting down. My question is. Is it normal to have a dominant female? She loves the millet sticks, and he loves sunflower seeds. I am grinding pellets and putting that on their food for nutrition.
Any advice ? Should I take the box away entirely?