I don't have a child with this condition so will only add an observation I've made during my career.
I think the Foreign Service works well for most kids. In most cases they end up worldy (in a good sense!), confident and socially skilled.
Their biggest challenge is making and leaving a new set of friends every 2-3 years. This is painful/difficult for even the most socially-skilled kids. Those that have a hard time making new friends or fitting into new situations, have the hardest time.
As Joe noted, there are some very good schools out there, and embassy communities can be very supportive. You're in the best position to decide how this all balances out.