Scared 5yo

We've had a rough few weeks. In the last two weeks my children have been in two car accidents. One with their mum and one with their grandmother. Nothing malicious and no one seriously hurt just poor timing. We then came home yesterday to find another car accident in which I stopped to call police. Again no one seriously hurt. Really poor timing.
My son seems fine, hes 2. But my daughter, 5 doesnt. She slept in our bed for the very first time last night.
She keeps saying she's scared but says she doesn't know why and she is OBSESSED with talking about car accidents now. This is good obviously because I want her to be comfortable and open about how she feels but I don't know how to help her realise that this isn't normal and this most likely won't happen again at least for a long time.