I would suspect that the hen was a red sex link as scgamecock said they are the leading brown egg layers.
If they are they won't be sex linked because that only works for a first generation cross. But they could carry Rhode Island Red, New Hampshire Red, and/or White Rock blood. You won't be able to tell their gender by their color but they should grow up to be nice big brown egg layers.
If they were sex linked the females would be the darker ones. It'll be interesting to see how they grow up!