Theory that jess murdered her son before the loop started
What do people think about that theory, the theory that she killed her son in the house before the loop started? One theory is that after smacking her son and going to her bedroom, she was about to totally lose her temper and kill her son, which is when nice Jess comes in with a hammer and kills mean Jess before she gets the chance.
However that doesn't explain how Jess ended up in the loop.