I've lived with Rottweilers for over twenty-seven years now...females often seem like a different breed to me. My Annie is incredibly laid back 98% of the time, but just let a stranger approach the house and she morphs into Annie the Warrior Queen. My old girl, Alex, was the same way. My girls have lived to be touched by a kind and loving hand...just don't be someone who looks threatening.
Your girl Ziva is beautiful.
Yours are great looking pups and thanks for the compliment on Ziva. I rescued her, she was roughly 1. I think she was probably left to fend for herself though she was pretty well trained already. I also think a woman was very prominent in her life as even though she bonded to me very quickly she is especially fond of females (well so am I

She is also very protective as you mention Annie is. My vet seems to think there's a bit of Lab in her, she loves the snow too which is good ahaha.