I'd say talk to your doctor. I mean hell, sweetie, you could use the time off regardless, and you definitely don't need to get sick. I think the odds of her bringing it back with her are slim, but the consequences if you get sick are way worse than if, say, I got sick -- so call your doctor and see what he thinks the best course of action is. And then if he says you don't need to stay home, call in sick anyway. :)