I believe that your attorney's analysis is incorrect as a matter of law. Under the Uniform Interstate Family Support Act, A State that has issued a child support order retains continuing, exclusive jurisdiction over child support, "until all of the parties who are individuals have filed written consents" with the tribunal of the controlling state to allow "the tribunal of another state to modify the order and assume continuing, exclusive jurisdiction."
In short, even though the support obligor has requested that a GA court assume jurisdiction, an act that would ORDINARILY confir jurisdiction to the GA court, in this case, both GA and NC law expressly forbid the court from assuming jurisdiction until both you and she file a written consent with the NC court.
If everyone doesn't do this, then NC will later refuse to relinquish jurisdiction and there will be a battle between the States to garnish the obligor's wages.
I suggest you provide your attorney with my comments on this issue.
As a practical matter, it would be easier for the GA court to handle both custody and support simultaneously under GA law, however, in the event that you wish to enforce a contempt order against the obligor parent, it is always easier to do this in the court of the State where that parent resides. Anyway, them's the facts -- the decision, as always, is yours.