This must be so surreal for her. To play to this many people on a continent you've never been to before, being the only female act AND the youngest act to headline the biggest stadium in Africa...
People love to undercut and dismiss her success, but it's times like this when her position in the pop spectrum is very clear. It's all very well to shift X million singles and albums or have billions of people watch your videos for free, but it's an achievement on an entirely different level to convince 70/80,000 individuals to shell out to see you live.