1) I think the idea was to get more around the front of the barn to come over, not taunt the ones already there. Just my take.
3) Wondered that myself, but I guess they needed a reason to off Jimmy and make it count!
4) I think she was not able to because of the shock setting in.
4a) Later, while stopped in the middle of the road and after Glenn tells her he loves her.... Turn the car off, put towels in the windows and if the SUV is arockin', don't come aknockin'!