Honestly I wouldn't worry. I know some will tell you to wipe down the entire house after she leaves just in case the virus is shedding but I don't think that's necessary. I think that would be playing into the phobia and reinforcing. Your fear. People are back to their normal lives usually hours after their symptoms stop. People have almost certainly been in your house days after a bug, the people you see out in the community could have just gotten over something, etc. It happens all the time and we don't even realize but yet we still don't get sick. Try to just remember that. I don't think you're any more at risk in your own home right now then you are out in public on any given day. It's just emetophobia making you think that way