Unfortunately there is nothing more you can do than what you are doing now. Some viruses spread through air and formites so there really isn't much you can do for that even if you have washed up. SDA can be carried in your respiratory tract as wellas on your clothing, hands etc. so it is best to shower and scrub down before seeing the other ratties. I am glad to hear that she is going to introduce her to the other two.

I can't wait to see pics of her. She sounds like an agouti berkshire.