I think the line is down already. If she is on the floor, she could grab one of the struts that support the seats and hang on a while longer. If not, then it depends on how close to the exit she was when the line went down and if she was on the floor or is flying at the le3vel of the seat.
Since Jinny was all the way in the front, and she managed to hang on for a while, she is now about half-way down the aisle of the bus. I have an idea, but it can't work without her Stand. Unless someone else's stand can do something.
I doubt Yun is gonna kill all of them off before the RPG has really begun.....um, right?