She did quite well. Soft-spoken, articulate, queenly. Her English is good. (I believe Silvia is a native of Germany, so English would be no higher than her third language.)
They showed some video of scenes in Sweden (including that building made out of ice), to talk about how wonderful it would be to visit Sweden. (It is, btw. I'll be in Sweden for six weeks, May 31-July 11.)
The bulk of the interview was about the World Childhood Foundation. Queen Silvia talked about abuse of children (especially sexual abuse) around the world, e.g., in Brazil, Thailand, and Russia.