I have noticed that aggressive hens make very good protective mothers.
I had one that was so bad - was pecking others and made them bleed. I literally told her - if you keep doing this I'm gonna eat you!
And ehat did she do? The very next day went broody

I gave her duck eggs - hatched and raised them very well.
Last year I had a Bluebell hen that went broody and was sitting for 4 weeks untill I took her off - I wasn't expecting a hybrid hen to sit for so long. If I knew I would have given her some good eggs