Need advice

my girl in the ring is going with her head down not straight up!!
Wen I`m trying to pull the head up with the show lace shes gaging (choking)...I`m not puling hard, just a little. im trying to get the head up with shoving her a snack, but shes not looking up or stands still

Friday wear going to the trainer, but I would like to get a advice from you

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P.S.
Shes a good show dog. we have won 2 of 4 shows and got 1of3 junior champions....the head thing is her only imperfection
Thank you