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Erm... wait a few days or I guess if this is Camponotus then wait a few weeks before you start trying to introduce pupa. With eggs there is not realy anything to do with them except carry them around and clean them, especialy if they are in a stable environment. If they hatch into larva then she will probably be more active in caring for them. Introducing forieng brood now could cause her stress and as a consquence she might eat her own eggs and any brood you put in their. Or as chazzbo said possibly kill the callows right after they eclose. If she eats her brood without any indication of why then I would go ahead with the introduction, but it is probably best to wait.

chazzbo: I had the same problem when I introduced nocturnal species pupa to a diurnal species of honeypot ants(My M. kennedyi colonies). They cared for the pupa, but instead of seeing new workers all I saw was lightly colored ant corpses in their midden. They took to pupa of their own species a lot better. Although I think they may have killed a few of the same species callows anyways.