I don't think you can question the "solo" aspects of her achievements if she brought along someone for the ride who took pics and documented the flight for
PR purposes. Doing a UK to Oz flight in a Stearman is a helluva achievement. I've done 2000 mile one way flights in a slow plane over a few days and you get absolutely knackered physically and mentally. So TCT doing a 13000 mile journey takes tremendous effort and stamina not to mention piloting skills that merits recognition.
Even the space flights completed by the Challenger had crew members onboard whose primary function was to feed the monkeys, their presence didn't negate or diminish the skippers achievements.