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I did the same thing combining my mature hens with a large flock of pullets (29 pullets vs 3 hens), however I put the hens into the coop with the pullets at night and retrieved them in the morning. There was alot of pecking so I had to take them out early in the morning. It took until the flock of pullets were similar in size for them all to finally get along, but it took almost 5-6 weeks for them to get there. In the beginning, I only allowed an hour or two of interaction, then I allowed them to forage together. They didn't mingle together until about two weeks ago, while foraging out in the yard.
Although, I have had an instance of introducing two additional hens to a flock of 8 hens...one month after getting the 8 hens. They never got along! I had to give the two reds to a friend because I felt guilty they were getting pecked & their feathers were being plucked. The reds were quite a bit smaller than the other 8 hens, so maybe was why they were getting picked on.
I think it depends on the breed of chickens, the size/age, and the number of chickens being introduced vs #in current flock.