Firstly, glad you're OK Young 'Un. Don't be put off. I think is one of those things.
Secondly, it seems the driver did stop, but just didnt exchange details (but hopefully she was apologetic). I don't think this is the crime of the century here and hopefully the lady in the Astra has learned something and the roads will now be a bit safer, albeit at the expense of YoungUn's pants

. It sounds like she was in the wrong, but let's never forget, accidents do happen and i say +1 to swee'pea's advice, i generally assume everyone is out to kill me (cars, pedestrians, scooters, other cyclists).
I only offer sympathy to drivers as once in dead of winter i got into my car in the morning, cleaned the windscreen, then turned right up a hill. At the brow of the hill, the sunlight suddenly turned my windscreen to pure opaque white (at 30mph). I slammed on the brakes and pulled over, but in situations where you suddenly lose visibility, things can be missed. I could have easily killed someone there, but had done my best to be a responsible driver.
Anyway, just my take on things. Just glad you and your bike escaped unscathed.