CitiGos are great & very capable - I drove my mum's to Croatia & back plus a lap of the Nurburgring. The higher power versions even have a bit of kick (though that might just be because I'm used to driving a base spec van). Also somehow if you get the right version it's zero VED.
We really liked our 5dr CitiGo but I think the auto version is trash.
I think you'll be fine having her as the second driver whilse she's a learner.