At a recent holiday expo, I mentioned to one of the QF staff manning the stand that Ms 9yo had recently been diagnosed with Aspergers and it was suggested that I ring reservations and get that added to the booking so the crew know just in case (on the off-chance she plays up). Is that likely to affect where we're seated or anything? We're doing BNE-LAX-JFK and return in Feb.
No it wont affect where you are seated or anything but extra information like this is always very helpful to the crew if they do need to offer you assistance with your daughter especially since you are doing a long trip. I highly recommend you let reservations know or if not speak to the Manager on your flight and let them know in person.
All the best with your upcoming trip with QF