What about stainless steel? Do you get the expandable basket type ones in your country? Or the chinese bamboo ones, they are fine for general use as well. And if she prefers "natural" that would be the way I would go. You can get them in a huge variety of sizes, from little bitty ones to huge ones and you can stack 'em as well. They won't last as long as stainless steel, however, they are cheap enough so that you can replace them yearly. And when they are no longer fit for steaming the look ok as fruit or display bowls as well.