In my limited experience, it helps if the chicks have been around the adults prior to putting them in the coop/run together. This last batch has been in the yard with the adults since they were 3 days old (experienced mother) and it was a piece of cake integrating them. That said, this is only my 5th group of chicks.Zig, I had a hen hatch one chick from her egg stash a month or so ago. She was in the pen with 3 other hens and a rooster. Well he is a very independent chick and kind of does what he wants but the other hens totally accepted the chick and never bothered. Flip the page though, I had put a young pullet in there one time before and the same hens picked it to death. It was almost fully grown too. You just never know how these things will go. If the Mom does a good job of mothering the other hens probably won't get a chance to bother the chicks. A lot depends on how many chicks she has. This is one case that small groups are really much better. If she has too many she will loose track and not be able to watch them all as carefully.
I had a big hatch today and I am wondering why I set that many eggs. I just don't have a place to put them right now. So much is waiting on getting the building done.
I got my water heater for the building today. Too bad my water still isn't hooked up! I was going to work on plumbing but have to get the outside wall framed in in order to attach a wall to support my plumbing. I'm just going to have to go get a load of lumber soon and start building. Maybe after this weekend I'll have some birds sold and can actually afford to buy some.