I am asking how to get a barrel racing horse to stop kicking after each barrel.?

i am 14 and am going to a rodeo in 4 days and my horse has started kicking after each barrel and i was wondering how to stop her. she is a quarter horse and has had my whole family has riden her but mainly my younger sister and i think she picked up a habit. since she has got a new horse i have been riding her and i nearly fell off when she kicked up