'm really more concerned about your daughter seeing the images than I am about her misunderstanding. There are things we should try to keep from young children.
It is understandable that a 10 year old would make that error. I'm afraid plenty of adults who don't read or listen to news regularly might think the same.
I would urge you to have a talk with her about the images; about the fact that these are (were) real ordinary people and that sometimes natural disasters happen and bad things happen to good people. However, emphasize that she is safe and that this happened "far away" from where she is. And emphasize the good that the US is doing by trying to provide help.
Kids need to feel safe and they need reassurance that they are safe, and that while it is possible bad things might happen, it is so rare that it is nothing to worry about. Explain if it is true, that you don't live in an earthquake zone. Or, if you do, that your house and her school are specially designed for earthquake zones.
You wouldn't let her see adult images. Don't let her watch dead bodies.