I may be new to chickens, but I raised sled dogs for 10 years so I know a thing or two about dogs
You dog has collie in her? She isn't trying to KILL/EAT the chickens? My guess is her herding instincts are kicking in! She's trying to herd them but doesn't really know how. Make sure the dog knows that the behavior is a no-no. Be consistent and persistent.

You dog has collie in her? She isn't trying to KILL/EAT the chickens? My guess is her herding instincts are kicking in! She's trying to herd them but doesn't really know how. Make sure the dog knows that the behavior is a no-no. Be consistent and persistent.