fujii, I don't know about this flight but there is a fair bit of evidence for her "solo" Cape Town to London flight that she had significant planning and preparation support at each stop over as well on some legs having a lead aircraft to follow and or had another pilot on board to help out. Hardly what called be called solo.
No wonder there's a few sceptics.
I think this flight is being billed as recreating Amy Johnson's flight. To me that means as much as possible doing it with the same technology and methods as Amy used. I somehow suspect that hasn't happened on this flight. Re tracing the route might be a more appropriate description.