But the accident has only just happened. In real life you don't go rushing around to people catastrophizing. Cassie is not, remember, badly hurt. She's in overnight for observation. I agree, they COULD tell Sally, but equally in real life it is perfectly possible that they, for the moment, have got better things to do than be running around gossiping about Cassie being hit by a car. They have their own lives to be getting on with
I had a friend recently I saw get hurt and taken to hospital in a similar way. I spoke about it to their family three days later when I ran across them in the shops and expressed my concern and asked after them, knowing (as Sam does), that their situation was not bad. Remember Sam knows nothing here about the baby or the HIV. She'd have just been told at the nurses' station that Cassie was knocked down by a car and is going to be okay.
I think what happened re Cassie is much more like what happens in real life personally. More real than what has often happened on H&A when someone is hurt and every man and their dog seem to rush to the hospital to stand vigil. That's what I find the more unlikely scenario.
That's just my take on it anyway.