Oh my goodness, I love that pic! She's more interested in the food then the chickens! I love her color too, very pretty.
My dog Nikki is a two year Heeler/Border Collie/McNabb mix. I raised her around the chickens just like you are doing, they very quickly became old news to her. She has never touched a chicken. She knew from day one that they are my chickens and that she is not to bother them. It's just constant reinforcement of good behavior and never leaving pup alone with chickens. These Border Collie mixes are great dogs in my opinion, they are EXTREMELY smart dogs. They want to know what you want from them and they want to do it. It's true that they are a go all day dog and then go some more after dinner! Mine is a ranch dog and I have yet to see her tired!
Good luck with your new girl, I think you are on the right track with her.