She was on a scooter attempting to turn left, amd the car was coming from behind her and tried to overtake on the left?
Was she turning from the left side or middle of the lane with a turn indicator on? Hopefully, we'll get more details. Obviously, you shouldn't just pass a stopped vehicle on the left side at full speed, indicator or not. You need to slow down and figure out what they're doing. If they're on the right side of their lane, then maybe you think they're pulled over and are not expecting them to suddenly go left.