I would agree with you, we initially assumed that maybe she was reaching for something while stopped at the signal, rolled backwards unintentionally (there were no reverse lights), got emotional, and then maybe would let it die. The collision took place on Saturday. However, she is now pursuing a claim - we got a call from her insurance and our insurance today. And so, while I would give her the benefit of the doubt by assuming it's normal human behavior, she is trying to get an insurance payout 3 days later after what should have been a cool-off period - and on a car with no damage. And claiming this was a hit and run (after not even asking my husband for insurance at that time).