Here's what to do: first off, Don't use your bridle to worm the horse. It will only cause another issue,, bridling. Ok? Before her next worming, get an empty tube at a local tack or farm store. They have empty syringes. Everytime you are with her, rub her mouth. She probably will resist but Don't stop rubbing till she calms down a little. Then quit. Then repeat until she calms and stop. Repeat as much as you want until she accepts your hands all over her mouth.
Then the next day do it again until she calms and slip your fingers in the corner of her mouth. Like it is an oooops. But its not. Continue the rubbing and keep slipping your fingers in the corner of her mouth until she accepts that. The next day the same all over and now stick your fingers further in. Keep repeating until she accepts that. Next day, same thing but now introduce the syringe and use that as just a part of your hand. Rubbing with it and gently poking it in the corner of her mouth. Do this everyday until you are able to get it in her mouth.
Now when you are ready to get it in her mouth, fill it with either sugar water or applesauce. Anything sweet. Put it in her mouth then squirt a little. Let her get a taste and do it again. Then maybe do this twice a week. I hope it works. Be patient, and don't stop rubbing and all until she calms. Good luck
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