In the novel Zero Calvin, Ariel started her life as the disembodied voice of an artificial intelligence - one that effectively runs the world. However, in the second sequel, Two Calvin, Calvin needs to create a hologram of her in order to help sell his guides, which are sort of like Google Glass but much more stylish. With their augmented reality capabilities, Ariel is able to insert herself into the real world and guide people around a fair hosted by Calvin (or their entire lives if they so desire).
Since Calvin has a bit of a thing for fairy girls, he makes Ariel into something like a fairy princess with the hope that her looks will put everyone at ease. This does work, although maybe some marriages are put at risk as well.
You can find out more about the Zero Calvin series here: https://briancramerbooks.com/zero_calvin_series.html
And you can watch her being modeled here: https://www.youtube.com/watch?v=Qtyh1U98KrM