I have a Pom mix, he is very mellow, did not get the yappy of the Pom. He is very good around the chickens, even when they were chicks. Our other dog is a Chiu/Jack Russell mix. Introduced her to the chickens when she was 7 weeks old, the chickens were about 15 weeks. She startled them at first, but the next day she just laid down with them & they thought she was a chicken too. She would dig a hole, they moved her out of the way & used it for a dust bath. She had a piece of lettuce in her mouth, they took it out of her mouth.Now she is 4 months old & loves to run around the yard with the other dog, and will sometimes scatter the hens. This puts our Roo into defender mode, and he will chase the dogs. Gave a good peck to out mellow dog, so now Marty stays clear of our Roo. Sophie has the happy go lucky attitude, and wants to play with our Roo when he is in defender mode. I tell her, when he gets you & you cry, I will not feel sorry for you.
Now our Silkies are a different matter all together, Marty can't quite figure out what they are, but when they roam the kitchen (yes they are spoiled), he will watch them and tilt his head when the chirp and peep, but he will stay at my feet. I usually have Sophie outside when the Silkies are out, just for precautions.
I would say, just keep them locked up safe, and when they are bigger, keep trying to introduce her to them. Once they get big enough to defend themselves, and you are there to supervise, see how she reacts. All it may take is a good peck from one of them to snap her out of her mode. Mine I know I can trust with my chickens, because I know my chickens will beat the tar out of my dogs.