They will settle down in a few days. But I think the smart thing to do would to keep them separate where they can still see each other. Then when the chicks are at least eight weeks old limit the time together till you see how things are going. Truth is you really don't know how easily an adult will accept chicks. When a broody raises chicks with the flock experienced about chicks, the chicks can wander far from mom among the adults without worry. But a single bird with an unknown experience with chicks, without a broody sponsor, you never know how it will go. So give them time to grow a little more and get used to each other through wire.
