If her daughter was sick on Saturday, what were they doing at your house on Sunday. I agree with mjewell that if she probably embellished her V** episodes a bit. However, that does not negate that this is a nasty thing.
Hearing this just makes me so nervous. I am waiting for this to blowup around here. Usually from right before Valentine's Day until about March 1st, we get hit really hard. Then it dies down a bit and resurfaces again in April for another two week stint. I am just waiting.
You are now in "the wait." You will have to ride the storm. If by Friday morning no one in your house is sick, you can assume you are safe from the exposure to them. BUT ---- you could be exposed to someone else has this thing is so out there in the public.
Stella