Her outfit is white felt with magenta, lilac and mint coloured self-adhesive felt for the details.
She is very pretty when assembled with a friendly face. I can see why Riki married her. :3 Her hair is made from pink and white feathers that have been curled with heat (I was able to buy them like this on eBay). It’s not an exact representation of her hair but it compliments the way Riki’s hair has been achieved very nicely.
If you would like to make Oka yourself, I’ve made the sewing template available here.