If Harry were to continue his military career, I don't think he'd have a full diary of royal appointments which would leave his wife with plenty of time to pursue her own career. I was thinking that if it was Chelsy and she wanted to pursue her legal career while married, perhaps she could even join the team of legal eagles that work for the Firm or even for some of the charities that Harry is patron of.
This sounds like some good ideas. The only problem would be the appearance that she is cashing in on her connections. This was one of the most prominent accusations thrown at Sophie and Edward. The royal family having seen the failing at their attempt at mixing the two worlds might make the family reluctant to endorse the plan.
I do hope that some agreement can be worked out. I think it would be a great way to match what appears to be Harry's career plan as Iluvbertie has said.