No, don’t be concerned about what breed the mother is. I’ve had my Seramas and Mille Fleur d’Uccles hatch each others eggs (Silkie and Sebright chicks also), and I’ve never had issues. This is just one of those rare situations, where the hen didn’t take to the chick for any of a number of...
I can ONLY tell you how I’d handle the same situation. Continuing to get the hen to accept the chick is likely a bad idea now. It needs consistent warmth and close monitoring for its own safety. Every time the hen rejects it, you run a greater risk of it being killed by a hen or from getting...