Yeah, I definitely wouldn't rush out to vaccinate the family against it. Testing her immediately and then doing a follow up test is a good idea. It's a pretty mild disease anyway, from Dr Sears webpage:
This virus causes a severe intestinal “flu” and mild liver damage in adults. It is very mild in young children, however. It is fairly common, but virtually never fatal.
I think if she were to test positive, I'd just focus on being a bit more cautious in the sharing of utensils, food, drink, etc, and also keeping up on cleaning the bathrooms frequently (especially once she's potty trained).
I don't remember...is this one that once you have it you are always positive? Or can you "get over" it? Hm, I'll have to look that up again!
Congratulations on your new daughter!!!!!