Wyandottes are supposed to make decent mothers, and the one australorp we had go broody was an awesome mother. Your unidentified bird--can you post a picture? That sounds like a satin silkie (silkie cross) to me.I now have a gold lace gold lace wyandotte setting on eggs & every now & then there is a silver lace wyandotte . in there instead , & , I have a black australorp setting , & , I do not know what it is it has a beard , feather legs & 5 toe's setting on eggs ,
It depends a lot on the individual whether she will make a good mother.