
As most Greys when in training are kennelled with a companion, then I can't see there being any special issue beyond what introducing any pup to an adult would entail.
in other words, make sure she can always get away rom pup, and don't expect her to feel love at first sight initially, and even for her to be somewhat hostile to him until he's over about 12 weeks. some adults simply don't 'do' puppies.
If she snarls and roars at him,. let her (within reason), he will take his cue from her (likely to yell his head off and act as if he's being murdered an show submission).