Are you using a chain for doing showmanship? Utilize it with swift one time correction & stand quiet a moment for her to process that & turn her focus/respect toward you & proceed on. If she attempts again, correct again & again as needed till she clues in
.You have to refocus her to you & the work at hand, maintain a calm yet firm consistent manner of direction.
Chain for showmanship goes under jaw not over nose. The chain normally is in neutral/relax tension.Any tension or small jerks to the chain are for correction/direction only. Once horse has responded to it tension should be immediately released.A trained showmanship horse rarely has contact/tension from the chain.
My Showmanship mare knows when it is time to work & basically shadows my movements/body language until I tell her she can chill stand & relax
.Like a riding horse when you pick up the reins to go work,their attention should be on you & the job.