Sounds more like a failure to yield? She tried to turn in front of approaching traffic. That should have zero affect on people following. You hit somebody from behind, it's your fault. The only way you are EVER not at fault is if the person you hit was drunk. They take the blame for everything.

I saw a girl pull up to a stop sign, stop, turn right out into the path of a motorcycle. Bike hit car from behind, biker dies. Car driver gets improper turn ticket.