Yes, we did it with our day old white rocks. They were all fine I mixed 14 two- week old chicks with the 2 whites and they all got along well. We started be just putting the tiny ones in a box in the brooder with the other chicks, so they would get used to the noise. Then after a day or so we mixed them with no fighting at all. It could be different with your chicks but this is how it went with ours. It could be harder though to mix her in with the flock when they are hens, so I would recommend them being together as chicks. 
